18
Type the correct answer in each box. Use numerals Instead of words. If necessary, use / for the fraction bar(s).
The grades received by 200 students follow a normal distribution. The mean of the grades is 70%, and the standard deviation is 7%.
The number of students who received a grade greater than 70% is about
. and the number of students who got a grade higher than
84% is about
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Answer: 100
5
Step-by-step explanation:
a) The mean of a normal distribution is also the median. Half the population will have values above the mean. Half of 200 is 100, so ...
... 100 students will have grades above 70%.
b) 84% is 14% above the mean. Each 7% is 1 standard deviation, so 14% is 2 standard deviations above the mean. The empirical rule tells you 95% of the population is within 2 standard deviations of the mean, so about 5% of students (10 students) got grades higher than 84% or lower than 56%. The normal distribution is symmetrical, so we expect about 5 students in each range.
... about 5 students will have grades above 84%.
A survey found that 25% of people gave up their home phone years ago and only use a cell phone now. If 3,000 people said that they only use a cell phone now, how
many total people were surveyed?
Answer:
12000
Step-by-step explanation:
25/100 = 3000/total people surveyed
total people surveyed = 3000×100 / 25
= 12000 people surveyed
2.1 There are 5 red balls, 3 blue balls and 2 green balls in a box. Suzie takes at random a ball from the box and gives it to her friend. She then takes at random another ball from the box.
2.1.1 Write down the sample space of this experiment. [2]
2.1.2 Work out the probability that both balls are of the same colour.
Answer:
23
Step-by-step explanation:
I just did it.
This is a review of last lesson's concept You have 2 red marbles, 3 black marbles, and 2 blue marbles. You pick a marble, look at it, and replace it in the bag Then you pick a marble again. What is the probability of picking a red marble both times?
Help plz plzzzzzzzzzzz ASAP
Given what we observed in #8, how does the area of AFD above compare to the area of ABC ? Explain your answer.
Answer:
This is because the four triangles formed are all identical to each other.
Please Help!!! I will give brainliest!
Answer:
D
Step-by-step explanation:
Table a has a output set for every input, making it a function. However, table B has 2 different outputs for 1 input. Therefore, A is a function and B is not.
Urgent, HELP! I need this ASAP
Answer:
Y repersents 1
Step-by-step explanation:
Answer:
y= 6 z = 7.5 x = 5(1/3)
Step-by-step explanation:
the ratio from small to big multiply by 4/3
from big to small multiply by 3/4
the width of a rectangle is 7 cm less than twice its length. its area is 30 square cm. find the dimensions
Answer:
l = 6 cm
w = 5 cm
Step-by-step explanation:
l(2l - 7) = 30
2l^2 - 7l - 30
(2l + 5)(l - 6)
l = 6
2(6) - 7 = 5
Seiko has 7 coins that add up to $1.10. She has the same number of quarters as dimes. The rest of the coins are nickels. How many of each coin does she have?
Answer:
She would have 3 quarters, 3 dimes, and 1 nickel.
Garth picked peaches from his grandfather's orchard. He picked more than 5.7 pounds but less than 7 pounds. which of the following could be the exact number of pounds of peaches he picked?
Answer:
i believe the answer is 6 pounds:)
Step-by-step explanation:
Express 72km/h in meter per sec
Answer:
20meter per second is tw correct answer
20 m/s
Step-by-step explanation:
1km/h = 1000m/3600s = 5m/18s
⇒ 72 × 5 ÷ 18 = 20 (m/s)
Write the equation of the lines which have the following parameters. Write the equation in slope intercept form.
1. slope = 3; y-intercept = 5
2. slope = 2/5; y-intercept =-10
3. slope = -3/2; y-intercept = -2
4. slope = 18; y-intercept = 0
5. slope = -3.253; y-intercept =-14.159
6. Challenge problem: x-intercept = -2; y-intercept = 6
Answer:
Step-by-step explanation:
Slope intercept form is :
y = mx + b
where m is the slope and b is the y-intercept.
So, given slope and y-intercept, all you have to do is plug in slope for m and y-intercept for b.
1.) y = 3x + 5
2.) y = 2/5x - 10
3.) y = -3/2x - 2
4.) y = 18x
5.) y = -3.253x - 14.159
For question 6, you need to calculate the slope given the two points then plug in the slope and y-intercept to get the equation.
So to find slope, you use the equation below:
slope = (y2 - y1) / (x2 - x1) = (6-0) / (0 - -2) = (6) / (2) =3
6.) y = 3x + 6
Someone walked%s the length of this room
then walked backward 4 the length of this
room before walking forward / the length
of the room and hiding the key there. How
far across the room (as a fraction) is the
key? Use a "/" as a fraction bar in your
answer.
Answer:
E-e-e-e-et-t-t-o.... B-b-b-b-b-baka h-h-huh... g-g-g-g-g-g-gOmensas-s-s-sai S-senpai...
Step-by-step explanation:
uHM yeah
Find the missing angles in the diagrams below.
Answer:
a. 27° + (2x° + x°) = 180° (linear pair)
27° + 3x° = 180°
3x° = 180°-27°
x° = 153°/3
x° = 51°
2x° = 2×51 = 102°
b. a° = 142° (vertically opposite)
c° + a° = 180° (linear pair)
c° = 180° - 142°
c° = 38°
i° = c° = 38° (vertically opposite)
A point of sale transaction occurs when a debit card is used to purchase items at a grocery store. Please select the best answer from the choices provided.
Answer:
True or T
I tested on edge
Answer:
Its true
Step-by-step explanation:
right on edg 2022
Can someone please help me with 4 and 5 ???
Answer:
4. D
A: -25.5=a
B: b=-4
C: c=12
D: d=8
Step-by-step explanation:
4.Between a and d they are the 2 bigger values but D was the greatest out of all of them. - divided by a - will result as a positive and 7/9=0.77 and 19/12 *I looked for the least common factor and multiplied numerator and denominator to 12 depending on the denominators value. Ex: since one of my denominators was 4, I multiply the whole fraction by 3 to get 9/12 and the other was 5/6 times 2 is 10/12 and just add 10/12 by 9/12 which is 19/12.
5.
A: All I did was multiply 8.5 and -3 and get -25.5=a.
B: I add 7 on both sides of the equation and -7 and 7 get canceled off and -11+7=-4. b=4.
C: I multiplied - to -3 and got 3, now I can subtract -3 on both sides. 15-3=12 so c=12.
D. I had to divide by 4 on both sides to get d by itself. 32/4=8 so final answer would be d=8.
Math grade 9 , see the photo and solve plzzz i need it very fassttt plzz
Is -2.4 and 1.5 repeating or terminating decimals?
Answer:
terminating decimals
Step-by-step explanation:
Which equation has x = −2 as a solution?
a
2x + 10 = 14
b
2x + 8 = 4
c
3x + 10 = 1
d
3x − 8 = 7
Answer:
B
Step-by-step explanation:
The answer is B because 2 x -2 + 8 = 4 So it matches up in that equation so answer is b
Answer:
2×+8=4
Step-by-step explanation:
hope it helps.....................
Helllps please help this timed please I will mark brainliest. PLz. NO LINKS OR I WILL REPORT YOU. Please give an explanation.
Answer:
please????
Step-by-step explanation:
Constant of Variation
State the relationship between the graphs of f(x) and g(x)
f(x) = 1/x², g(x) 1/x⁴
a. g is closer to the y-axis, and f is closer to the x-axis.
b. g is symmetric about the y-axis, and f is symmetric about the origin.
c. g is symmetric about the y-axis, and f is symmetric about the x-axis.
d. g is closer to the axis, and f is closer to the y-axis.
Please select the best answer from the choices provided
Answer:
D. G is closer to the axis, and f is closer to the y-axis.
Step-by-step explanation:
I calculated it logically
What is the sales tax
On a camera priced at $110 if the sales tax rate is 6.1%
WILL GIVE BRAINKISR
Xx
X
X
Answer:
Before Tax Price: $110.00
Sale Tax: 6.10% or $6.71
After Tax Price: ($116.71)
Step-by-step explanation:
Divide using common factors.
(x^2 + 3x – 4) ÷ (x - 1)
Answer: Hello Luv.......
Factor the numerator and denominator and cancel the common factors.
x+4
Step-by-step explanation:
Hope this helps.
Mark me brainest please.
Anna ♥
a ratio of 14:40 =13;?
Answer:
9.75
Step-by-step explanation:
A cylinder has a height of 9.5 cm and a radius of 4 cm. What is its volume? Use 3.14 for π and round your answer to the nearest tenth.
Answer:
477.3
Step-by-step explanation:
3.14x 4² x 9.5
477.28
to the nearest tenth= 477.3
Write sixty-five and three hundredths
a. as a decimal number
as a mixed number
Step-by-step explanation:
answer in decimal form 65.03
answer in mixed number form 65 3/100
PLEASE HELP I don’t know the answer and I need it fast
What is the volume of a cylinder with a height of 13.6 cm and a base with a radius of 6.6 cm, to the nearest tenth of a cubic centimeter? !!!asap
Answer:
1,861.1 cubic centimeters
Step-by-step explanation:
Volume of a cylinder is
[tex]v = \pi {r}^{2}h[/tex]
so you would plug it in and solve
[tex]v = \pi ({6.6})^{2}13.6[/tex]
Find the arc length
Answer:
13.92
Step-by-step explanation:
You can refer to the photo I attached
PLEASE HELP THIS IS VERY IMPORTANT I'LL GIVE YOU BRAIN THING IF ITS CORRECT!! <3 NO LINKS PLEASEE.
Answer and Step-By-Step Explanation:
The point shown is marked at (36,82), meaning that the panda is 36 months old and weighs 82 kilograms. To plot the next point, just go up from 110 on the graph to 90 and mark a point. (Sorry I tried to put an image but it was extremly blurry.)