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Y_Kistochka [10]
3 years ago
5

Suppose that 1% of the students in a school have head lice and the test for head lice is accurate 75% of the time. What is the p

robability that a student in the school has head lice, given that the test came back positive?,
Mathematics
2 answers:
Pavlova-9 [17]3 years ago
4 0
Answer: There is a 2.9% chance that a person has head lice given that the test is positive. (I know that sounds very low, but watch the math)

Imagine there are 10,000 students in the school. If 1% have lice, that makes 100 students that have it and 9,900 that don't.

Assume the test was given to all students. Out of the 100 that have lice, only 75 would get a positive test because it is only 75% accurate.

Now, out of the 9,900 student who don't have lice, 25% of them would get a positive test, because the test is only 75% accurate. That is 2,475 false positive tests!!!

So we had a total of 2,550 positive tests, but only 75 of those students actually have lice. 75 out of 2550 is 2.9%.


Stells [14]3 years ago
3 0

Answer:

2.9% (APEX)

Step-by-step explanation:

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Step-by-step explanation:

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3 0
1 year ago
Mae Ling earns a weekly salary of $305 plus a 6.0% commission on sales at a gift shop. How much would she make in a work week if
insens350 [35]

Answer:

Mae's weekly salary plus 6.0% commision= $305

she makes in a work week after selling= 6/100 x$4400

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Total weekly her earning= $305+$264

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Step-by-step explanation:

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The lines on a 2-cup liquid measuring cup divide each cup into eighths. If you measure 1 3/4 cups of water, between which two qu
masya89 [10]

Answer:

1 3/4 cups is between the 13th and 15th lines from the bottom.

Step-by-step explanation:

The bottom of the cup has no line and corresponds to 0 eights.

1st line up: 1/8 cup  

2nd line up: 2/8 cup    this is also called 1/4 cup

3rd line up: 3/8 cup

4th line up: 4/8 cup     this is also called 1/2 cup

5th line up: 5/8 cup

6th line up: 6/8 cup     this is also called 3/4 cup

7th line up: 7/8 cup

8th line up: 8/8 cup     this is also called 1 cup

9th line up: 9/8 cup

10th line up: 10/8 cup    this is also called 1 1/4 cup

11th line up: 1 3/8 cup

12th line up: 1 4/8 cup     this is also called 1 1/2 cup

13th line up: 1 5/8 cup

14th line up: 1 6/8 cup    this is also called 1 3/4 cup

15th line up: 1 7/8 cup

16th line up: 1 8/8 cup    this is also called 2 cups

1 3/4 cups is between the 13th and 15th lines from the bottom.

7 0
3 years ago
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