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Explanation:
There are 7 dimes and 3 pennies, leading to 7+3 = 10 coins total.
The probability of not picking a penny is 7/10. If the first coin is put back, then the probability doesn't change for the second selection.
The probability of getting two dimes is (7/10)*(7/10) = 49/100 when the first coin is replaced.
If the first coin is not replaced, then the answer would be (7/10)*(6/9) = 42/90 = 7/15
I’ll give brainliest or whatever it’s called
how to solve -x^2-2x+1
Answer:
Common factor
Factor by grouping
Factor by grouping
−
2
−
2
+
1
-x^{2}-2x+1
−x2−2x+1
−
1
(
2
+
2
−
1
)
{\color{#c92786}{-1(x^{2}+2x-1)}}
−1(x2+2x−1)
Solution−
-1(x²+ 2x-1 )
pepe the pog pog pog pog pog
Answer:
c
Step-by-step explanation:
Answer:
B. 10
Step-by-step explanation:
4, 11, 6, 9, 23, 24, 6, 19
4, 6, 6, 9, 11, 19, 23, 24
9 + 11 = 20
20 ÷ 2 = 10
easy math have fun!!!
Answer:
A = 12
Step-by-step explanation:
First you need to get the length from the perimeter, the formula is l= p/2 - w
After using the formula, you would get 6 for length. The formula for the area of a rectangle is a = lw, so you would multiply 6 and 2 which would give you 12 as your answer.
I apologize if I made any grammar mistakes or if it is unclear.
Answer:
I got area is 12 too
Step-by-step explanation:
2x2=4 because 2 widths
16-4 to find the 2 lengths added up
12÷2 to find the length
6x2=12 because length times width
The quality-control manager at a compact flourescent light bulb factory wants to test the claim that the mean life of a large shipment of cfls is equal to 6500 hours. the population standard deviation is 500 hours. a random sample of 50 cfls indicates a sample mean life of 6,700 hours and sample standard deviation is 600 hours.
Critical values, where P(Z > Z) - a and P(t >) - a 2016-1282 20.06-1645 20.02 -1.960 10.10. - 1.299 10.06.45 - 1677 foto - 2010 1.115 pt.
a. At the 0.05 level of significance, is there evidence that the mean life is different from 6,500 hours?
b. Compute the p value and interpret its meaning.
c. Construct a 95% confidence interval estimate of the population mean life of the CFLs.
d. Compare the results of (a) and (c). What conclusions do you reach?
Answer:
a. At the 0.05 level of significance, there is evidence that the mean life is different from 6,500 hours.
b. The p value= ≈ 0.00480 for z- test which is less than 0.05 and H0 is rejected .
The p value= 0.006913 for t- test which is less than 0.05 and H0 is rejected for 49 degrees of freedom.
c. CI [6583.336 ,6816.336]
d. The range of CI [6583.336 ,6816.336] tells that the cfls having a different mean life lie in this range.
Step-by-step explanation:
Population mean = u= 6500 hours.
Population standard deviation = σ=500 hours.
Sample size =n= 50
Sample mean =x`= 6,700 hours
Sample standard deviation=s= 600 hours.
Critical values, where P(Z > Z) =∝ and P(t >) =∝
Z(0.10)=1.282
Z(0.05)=1.645
Z(0.025)=1.960
t(0.01)(49)= 1.299
t(0.05)= 1.677
t(0.025,49)=2.010
Let the null and alternate hypotheses be
H0: u = 6500 against the claim Ha: u ≠ 6500
Applying Z test
Z= x`- u/ s/√n
z= 6700-6500/500/√50
Z= 200/70.7113
z= 2.82=2.82
Applying t test
t= x`- u /s/√n
t= 6700-6500/600/√50
t= 2.82
a. At the 0.05 level of significance, there is evidence that the mean life is different from 6,500 hours.
Yes we reject H0 for z- test as it falls in the critical region,at the 0.05 level of significance, z=2.82 > z∝=1.645
For t test we reject H0 as it falls in the critical region,at the 0.05 level of significance, t=2.82 > t∝=1.677 with n-1 = 50-1 = 49 degrees of freedom.
b. The p value= ≈ 0.00480 for z- test which is less than 0.05 and H0 is rejected .
The p value= 0.006913 for t- test which is less than 0.05 and H0 is rejected for 49 degrees of freedom.
c. The 95 % confidence interval of the population mean life is estimated by
x` ± z∝/2 (σ/√n )
6700± 1.645 (500/√50)
6700±116.336
6583.336 ,6816.336
d. The range of CI [6583.336 ,6816.336] tells that the cfls having a different mean life lie in this range.
someone please help me
Answer:
the answer is 35 mi
Step-by-step explanation:
28 squared = 784
21 squared = 441
784+441 = 1225
Square root of 1225 is 35
Carson = C
Hanford = H
Ridgewood = R
CR²=CH²+HR² <=>
<=> CR²=28²+21²=1225 <=> CR=√1225=35
Help please first person to answer it right gets Brainliest
Answer:
its the first one
Step-by-step explanation:
HELP
WILL GIVE BRAINLIST
FOR MATH
...
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.
.
.
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.
Answer:
20 cyclists
Step-by-step explanation:
In 2007 only two bikes are there which mean only 20 cyclists participated and that is the least amount out of all years
Answer:
if each bicycle is ten go by multipls of 10
it's in 2007
and of you count by 10 that's 20
which expression is equal to 45 x 4-7: 4-2?
Answer:
12
Step-by-step explanation:
if x equals to 6 than
6+6=12
Which equation represents the relationship between X and Y shown in the table?
Answer:
y= 2x-3
Step-by-step explanation:
to find the slope you use rise over run to get 2. to check to see the correct equation replace x with any of the x values in the chart and if you get the same y values as the chart then your equation is correct.
Construct an equation for the expression: 3 less than 2 times a number is 7. Show the solution to the equation and prove your solution to be true through your work.
Answer:
5 x 2 -3 = 7
Step-by-step explanation:
i mean.... thats all
Aaron bought 7 packs of balloons for the party. There were 50 balloons in each bag. 40 of the total number of balloons were yellow. How many balloons were not yellow?
Answer:
[tex]total \: balloons = (50 \times 7) \\ = 350 \: balloons \\ none \: yellow \: balloons = 350 - 40 \\ = 310 \: none \: yellow \: balloons[/tex]
Answer:
310
Step-by-step explanation:
The equation that we would use to solve this problem is 7 × 50 - 40 = b
(b is the number of non-yellow balloons)
Since Aaron bought 7 packs of balloons with 50 balloons in each pack, we would need to multiply 7 and 50 to find the total amount of balloons that he bought.
7 × 50 = 350.
Now we subtract 40 (the total number of yellow balloons) from 350 (the total number of balloons), to find the amount of balloons that are not yellow.
350 - 40 = 310
What is the mode of 7 3 3 6 3 7
Answer:
3
Step-by-step explanation:
3,3,3,6,7,7
the mode is the number the occurs the most and 3 is there 3 times so it is the mode
Answer:
3
Step-by-step explanation:
Since 3 occurs the most in the set of data, it is the mode.
Mode: The mode is the value that appears most frequently in a data set.
I hope this helps! Have a great day! :)
hellpppppppppspspspspspspsp
I'd say 13, hope this helps
Step-by-step explanation:
True or false: The equation below is too complicated to use the "isolate the
radical, then square both sides" method to simplify.
Answer: False
=============================================================
Explanation:
The radical is one step away from being fully isolated. We would apply the rule that [tex]\frac{\sqrt{A}}{\sqrt{B}} = \sqrt{\frac{A}{B}}[/tex]
In this case,
[tex]\frac{\sqrt{x+3}}{\sqrt{x-1}} = \sqrt{\frac{x+3}{x-1}}[/tex]
Meaning that the equation
[tex]\frac{\sqrt{x+3}}{\sqrt{x-1}} =3[/tex]
is the same as
[tex]\sqrt{\frac{x+3}{x-1}} = 3[/tex]
From here, we square both sides and use algebra to isolate x.
20 men can complete a piece of work in 24 days how many men should be subtracted to finish the work in 32 days?
Answer:
5 men should be subtracted.
Step-by-step explanation:
This question is solved by proportions, using a rule of three.
As these measures(number of men needed and time) are inversely proportional, we multiply the lines instead of cross multiplication.
How many men should be working to complete the work in 32 days?
20 men - 24 days
x men - 32 days
Then
[tex]32x = 20*24[/tex]
[tex]x = \frac{20*24}{32}[/tex]
[tex]x = 15[/tex]
How many men should be subtracted?
There are 20 to complete in 24 days.
15 are needed to complete in 32 days.
20 - 15 = 5
5 men should be subtracted.
In a psychology class, 60 students have a mean score of 96.9 on a test. Then 19 more students take the test and their mean score is 71.3.
What is the mean score of all of these students together? Round to one decimal place.
Help please, and thank you! C:
Answer:83.3
Step-by-step explanation:
a school has 60 girls and 90 boys. the ratio of girls to boys
Answer:
60:90
Step-by-step explanation:
The ratio of girls (G) to boys (B) is 2 : 3.
Let the girls be represented by G.Let the boys be represented by B.Given the following data:
Number of girls = 60 girlsNumber of girls = 90 boysIn this exercise, you're required to find the ratio of girls (G) to boys (B). In order to do this, we would divide the two values to the least.
[tex]G : B = 60 : 90[/tex]
Dividing both sides by 30, we have;
[tex]G : B = \frac{60}{30} : \frac{90}{30} \\\\G : B = 2 : 3[/tex]
Therefore, the ratio of girls (G) to boys (B) is 2 : 3.
Read more: https://brainly.com/question/12212308
1. There are 3,768 books on the library wall.
There are 24 rows of books, each with an equal
number of books. How many books are in each
row?
Answer:
157 books in each row
Step-by-step explanation:
24 rows=3768 books
1 row=3768/24 books
=157 books
Therefore,Each row contains 157 books
Mark this answer as brainliest....
A 2-column table with 5 rows. Column 1 is labeled Evelyn's Scores with entries 125, 137, 138, 145, 145. Column 2 is labeled Distance from the Mean with entries x, y, 0, 7, z.
What is the mean absolute deviation of Evelyn’s scores?
5.1
5.6
5.8
7
Answer:
Column 1(X) Column 2(mean - X)
125 -13
137 -1
138 0
145 7
145 7
Mean = 138
Mean Absolute Deviation : 5.6
Answer:
for all the lazy readers on top the answer is.. B. 5.6:)
Step-by-step explanation:
Is pop or country your favorite type of music?
Change This into a neutral question
prove that cosA-cos2A+2/3sinA-sin2A=1+cosA/sinA
Answer:
I don't know the answer
plss ask some one else
In the figure below, EC || AB. Find the length of EC.
Select the best choice from the answers provided.
A.) 12.5
B.) 18
C.) 25
D.) 39.6
Answer:
Letter a)
Step-by-step explanation:
quizlet
a food company can produce 732,291,285crackers per hour. A second food company can produce 732,341,285 crackers per hour.Which company can produce more crackers per hour. explain how you found your answer
Answer:
the second company
Step-by-step explanation:
the second company produces 50,000 more crackers an hour than the first company
m and n are parallel lines cut by a transversal.
What is the value of x + y?
Answer:
180°
Step-by-step explanation:
It will be answer ...............
Please help me!!!!!!!!!!!!!!!!!!
Answer:
6. peach , plum, crab apple
7. pepper tree, common apple, pear
8. because the graph is lowered And that the boxes are needed to go higher to get to the other numbers and the graph is misleading and etc.
9. black cherry, magnolia, live oak, sweet cherry.
10.because the graph is lowered And that the boxes are needed to go higher ot get to the other numbers and the graph is misleading
Step-by-step explanation:
I don't really understand 8 and 10 so this all i got
No Links/Incorrect Answers = Report
First to get the question correct get's brainliest.
I calculated this myself, and I got the answer 3/4, but I'm trash at explaining long problems. So here is what I found to help explain it. It's not a link.
"If (p, r) lies on the line y = x + b, then
r = p + b…. (1)
If (2p, 5r) lies on the line y = 2x + b, then
5r = 2(2p) + b
or 5r = 4p + b…. (2)
Subtracting equation (1) from (2), we get
5r - r = 4p + b - p - b
4r = 3p or r/p = 3/4"
Since I don't believe in plagiarism here's the person who is a life saver at explaining things.
(Mohammad Faizan)
PS. I really did try to explain it myself, only to give myself a headache, so please don't be mad and report me. I only wanted to help.
Answer:
a
Step-by-step explanation:
What are satellites
Answer:
A satellite is a moon, planet or machine that orbits a planet or star. ... Usually, the word "satellite" refers to a machine that is launched into space and moves around Earth or another body in space. Earth and the moon are examples of natural satellites. Thousands of artificial, or man-made, satellites orbit Earth.
Step-by-step explanation:
Please help me I am insanely confused!!! PLEASEEEEEEEEEEEEEEEE
Answer:
340.4 in³
Step-by-step explanation:
volume= (½× 8 × 6.9 × 10) + (⅓×½×8×6.9×7)
= 276 + 64.4 = 340.4 in³
HELPP IMA GIVE YOU 15 POINTS
For which data-generating process would a binomial distribution be an appropriate model?
A.flipping a coin to decide whether test subjects should use their left or right hand
B.randomly choosing a letter of the alphabet to pick the first names of test subjects
C.spinning a three-part spinner to decide whether each trial subject should be a child, an adult, or a senior
D.spinning a four-part spinner to decide whether survey customers should be from eastern, southern, midwestern, or western states
Answer:
A. flipping a coin to decide whether test subjects should use their left or right hand
Step-by-step explanation:
Since a coin has two outputs: heads or tails, it it has a binomial distribution