Answers
9514 1404 393
Answer:
136
Step-by-step explanation:
The attached chart shows the result of using the numbers in the problem statement to calculate the percentage of the population in each category.
95% accuracy on infected individuals is assumed to mean that 95% of the 2% who are infected return a positive test result. The other 5% return a negative test result.
Similarly, 90% accuracy on uninfected individuals is assumed to mean that 90% of the 98% who are not infected will return a negative test result, and the remaining 10% of those 98% will return a (false) positive test result.
Then of the 11.7% who return a positive test result, only 1.9% are actually infected. This fraction is a/b = 19/117, so ...
a + b = 19 + 117 = 136
_____
Additional comment
When forming ratios of percentages, one must be very clear about the base of the percentage. Above, the base for every percentage is the entire population of mathletes. The fraction 19/117 is the fraction of those who tested positive that are actually infected (about 16.2% of positives).
Answer:
the answer is 136
Step-by-step explanation:
:)))))
Related Questions
A seamstress is designing a flag in the shape of a right triangle. Which of the
following could NOT be the lengths of the sides of the triangle?
A) 18 m, 24 m, 30 m
B) 6 ft, 17.5 ft, 18.5 Ft
C) 7 Ft, 10 ft, 12 Ft
D) 21 in., 28 in., 35 in.
Answers
Answer:
Step-by-step explanation:
Find the total surface area of these rectangular boxes when they are (i) lidless and (ii) hollow.
a. length = 15cm, breadth = 10cm, height = 6cm
Answers
Answer: 450 cm squared if not including the inside surface
900 cm squared if including the inside suface
Step-by-step explanation:
A=2(wl+hl+hw)
A=2(150+90+60)
A=2(300)
A=600
but we have a lidless box so we need to subtract the lid...
600-(wl)=
600-(150)=450
If we are including the inside surface it would double as we would be covering both exposed surfaces of bottom, 2 ends, and 2 sides....
450x2=900
The surface area is 450 cm squared if not including the inside surface and 900 cm squared if including the inside surface.
What is surface area?The space occupied by any two-dimensional figure in a plane is called the area. The area of the outer surface of any body is called the surface area.
(i) The surface area will be calculated as,
A=2(wl+hl+hw)
A=2(150+90+60)
A=2(300)
A=600
But we have a lidless box so we need to subtract the lid.
600-(wl)=
600-(150)=450
(ii) If we are including the inside surface it would double as we would be covering both exposed surfaces of the bottom, 2 ends, and 2 sides.
450x2=900
Therefore, the surface area is 450 cm squared if not including the inside surface and 900 cm squared if including the inside surface.
To know more about a surface area follow
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I’ll give brainliest
Find the area of the larger sector.
Round to the nearest tenth.
2550
13.4 miles
Area
[? ]miles?
Answers
Answer:
Step-by-step explanation:
Answer: 399.6
Step-by-step explanation:
h
On a survey, 3 out of every 8 band members prefer listening to jazz music. Based on the survey, how many out of 240 band members would prefer listening to jazz music
Answers
Answer:
90
Step-by-step explanation:
What is the radius of the unit circle?
Answers
213.23
Answer:
1 is the radius of the unit circle. I think.
In mathematics, a unit circle is a circle with a radius of one. The unit circle is the circle of radius one centered at the origin (0, 0)
Step-by-step explanation:
Have a nice day!
and can I maybe have brainliest? Thanks!
2^2x-4^(2^x)+3=0 find the positive value of x
Answers
Answer:
0 and 1.5850
Step-by-step explanation:
Given the expression
2^2x-4^(2^x)+3=0
Let P = 2^x
P² - 4P + 3 = 0
Factorize
P² -3P-P +3 = 0
P(P-3)-1(P-3) = 0
P-1 = 0 and P-3 = 0
P = 1 and 3
If P = 1
2^x = 1
log 2^x = log 1
xlog 2 =0
x = 0/log 2
x = 0
Also if P = 3
2^x = 3
x log 2 = log 3
x = log3/log 2
x = 0.4771/0.3010
x = 1.5850
Hence the positive value of x are 0 and 1.5850
Expand the expression.
1/5(15+10x-5)
Answers
Answer:
2x+2
Step-by-step explanation:
farthest it can go
Describe the correlation between the amount spent and the number of people spending the money.
A) negative correlation; as the amount spent increases, the number of people spending that amount decreases
B) negative correlation; as the amount spent increases, the number of people spending that amount increases
C) positive correlation; as the amount spent increases, the number of people spending that amount decreases
D) positive correlation; as the amount spent decreases, the number of people spending that amount increases
Answers
Explanation: sorry if I’m wrong
Answer:
A. Negative correlation; as the amount spent increases, the number of people spendings that amount decreases.
It is so clear, just look at the graph and you will see exactly what im talking about
Which statement is true?
−2.4<−2.40
−2.4≠−2.40
−2.4≤−2.40
−2.4>−2.40
Which value of x is a solution of the inequality?
3x+5≤14
x = 3
x = 4
x = 5
x = 6
Which values are solutions to the inequality?
5r≤6r−8
Select each correct answer.
r = 7
r = 8
r = 9
r = 10
Which values from the given replacement set make up the solution set of the inequality?
2b–4≥2 ; {1,2,3,4}
{1,2,3}
{1,2}
{3,4}
{2,3,4}
Answers
Answer:
1. -2.4>-2.40
2.×=3
3.r=8
4.{3,4}
How much will be in the account after 18 years to the nearest cent
Answers
Answer:
A = $34,494.79
Step-by-step explanation:
The total amount accrued, principal plus interest, with compound interest on a principal of $9,000.00 at a rate of 7.75% per year compounded 1 times per year over 18 years is $34,494.79.
Write the equation of the line that passes through the point (-1,-5) and has a slope of -2?
Answers
Answer: Answer is B hope this helps
Step-by-step explanation:
Answer:
the correct answer is D. Hope it helps
i didn’t mean to pick that but can some one please give me the answer :(
Answers
Answer:
you were right
Step-by-step explanation:
180-104 is 76 76-10=66 66/2 is 33
Answer: x = 33
Step-by-step explanation:
Well since that line is basically equal to 180 all you have to do is plug in those numbers for x. Since 33 + 10 = 43 Alll you gotta do is add that up. So we have 104 + 33 + 43 = 180. I’m not the best at explaining things but I hope this helped :)
solve by using appropriate Laws of exponents
Answers
Answer:
answer is 0.1 ....................
pls answer me this all question correctly pls I beg you pls friends pls pls pls pls
Answers
A) 4/5.
B) 3/10
C) 1/2
2:
A) 62/15 = 4 2/15.
B) 73/36 = 2 1/36.
Hope it helps!
The question on the top is
A student spins The spinner once and rolls the 1-6 number cube once. The second question is
What is the probability a student spends an even number and rolls an odd number, written as a percentage?
10 points this is due tomorrow.
Answers
Answer:
Option C
Step-by-step explanation:
For the spinner,
Probability of spinning an even number = [tex]\frac{\text{Favorable outcomes}}{\text{Total outcomes}}[/tex]
Favorable outcomes = even numbers on the spinner
= 3
Total outcomes = Total numbers on the spinner
= 6
Probability of spinning an even number = [tex]\frac{3}{6}[/tex]
= [tex]\frac{1}{2}[/tex]
For the cube,
Total outcomes = total numbers on the dice = 6
Favorable outcome = Odd numbers on the dice = 3
Probability of rolling an odd number on rolling a cube = [tex]\frac{3}{6}[/tex] = [tex]\frac{1}{2}[/tex]
Probability of spinning an even number on spinner and an odd number on a cube = [tex]\frac{1}{2}\times \frac{1}{2}[/tex]
= [tex]\frac{1}{4}[/tex]
Percentage probability = [tex]\frac{1}{4}\times 100[/tex]
= 25%
Option C is the answer.
Need help on this please
Answers
Answer:
[tex]x^{2}[/tex] + (y-5)² = 8
5 1/4 fraction 2 3/4
Answers
please help me I will give a brainlist
Answers
Answer:
(-7, 31)
Step-by-step explanation:
73 7/10−25 5/8
Enter your answer as a mixed number in simplest form.
Answers
Answer:
48 3/40 just reanswerd for points :>
Step-by-step explanation:
HELP PLEASEEE
Solve 5x- c= k for x.
A. X - 5(k+c)
B. X = 5(k-c)
C.
k-c
X=
D.
kic
5
Answers
I need help plz NO FILES no files helpppp it do at 2
Answers
Answer:
B
Step-by-step explanation:
325/5= 65
2 numbers are over 65
Martin cycles at an average speed of 12mph. On Tuesday, he leaves his house at 9:15am
and goes on a bike ride for 40 miles. What time does he arrive home?
Answers
Step-by-step explanation:
40÷12= 3.33
so it approximately takes him 3hrs and 18minutes
so 9:15 + 3hrs 18 minutes is 12: 33 pm?
(3) I have 25 coins x of them are
R5 coins and the rest are R2 coins
An expression in terms of
for the number of R2 coins I have
is
Answers
Answer:
R2 = 25 - x
Step-by-step explanation:
x + R2 = 25
=> R2 = 25 - x
Sarah has two pizzas each pizza is cut into 10 equal slices she and her friends 14
slices what part of the pizza did they eat and how much is left right your answer as a decimal
Answers
Find the domain and the range of the relation shown in the given graph. Also, determine whether the relation is a function.
Answers
Answer:
yes, it is a function
D: {-4, -3, 0, 4}
R: {2, 4}
Step-by-step explanation:
GUYS! PLEASE HELP ME IN NO. 8 AND 9 WITH SOLUTIONS.
Find the area of each shaded region. Assume that all angles that appear to be right angles are right angles.
Answers
Step-by-step explanation:
Triangle
[tex] \frac{10 \times 4}{2} - \frac{5 \times 3}{2} = \\ = \frac{40}{2} - \frac{15}{2} = \\ = \frac{25}{2} [/tex]
Circle
[tex] {4}^{2} \pi - {2}^{2} \pi = \\ = 16\pi - 4\pi = \\ = 12\pi[/tex]
3
Hope made 3 different yo-yós. She used 1 meters of string for the first yo-yo, 1 meter of string for the
4
1
second yo-yo, and a total of 4 meters of string,
3
Hope uses the equation, 1 +1+y=4. to represent the situation.
What does the variable y represent in the equation?
Choose 1 answer:
Number of yo-yos Hope made
Number of meters of string in third yo-yo
Total number of meters of string Hope used
Answers
Answer:
The variable Y represents the number of meters of string in the third yoyo
Step-by-step explanation:
In this equation y stands for the unknown variable. The equation tell you that hope made 3 different yo-yos so the number of yo-yos hope made isn't unknown, meaning, it cant be the first answer. The problem also tells you that hope used a total of 4 meters of string which means that the total number of string used isn't the unknown variable. The number of meters of string in the third yo-yo is the only number that isn't. This makes the number of sting used in the third yo-yo the unknown variable, making it y.
An employee gets a signing bonus of $100 and is paid $25 per hour they work. Represent this scenario by writing an equation for x hours worked
Answers
Answer:
$(100 + 25x )
Step-by-step explanation:
X= number of hours
The numbers are just like money just without the dollar sign
100 + 25(x)
After you get your number remember to put your sign you were looking for
Hope I helped you out:)
Answer:
$(100 + 25x)
Explanation:
if the employee works for 1 hour, they earn 1 × $25 = $25. if they work for 2 hours, they earn 2 × $25 = $50. thus, representing the number of hours they work by x, we can say that they earn $(25x) per hour.
now, we add on the signing bonus: $(100 + 25x).
i hope this helps! :D
A=bh; find A when b=93 and h=69
Answers
Answer:
6417
Step-by-step explanation:
if A = b*h then when we substitute b for 93 and h for 69
A=93*69 = 6417
A=93 *69
=6417
.............
The results of an independent-samples t test were t(19) = 4.02, p < 0.05. In this example,
the sample size is:
Answers
The results of an independent-samples t test were t(19) = 4.02, p < 0.05. The sample size is 19.
What is independent t-test?The independent t-test is a defined as an statistical test in order to determine if we have statistically significant difference between the means of two unrelated groups.
Effect size is defined as a "quantitative measure of the magnitude of the experimenter effect" So, If we have a high value for the effect size then we can conclude that we have a stronger relationship between two variables.
T test is used to compare group means is one of the most common tests and is used to determine whether the means of two groups are equal to each other.
We perform one sample z-test;
One sample z-test is performed if the sample size is large enough (n > 30) and we want to know if the sample comes from the specific population.
The results of an independent-samples t test were t(19) = 4.02, p < 0.05. In this example,
The sample size is 19.
Learn more about one-sample z-test here:
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