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ivann1987 [24]
3 years ago
14

What is 50% out of 80 , could you explain how you get to the answer , thank you !

Mathematics
2 answers:
EleoNora [17]3 years ago
5 0
40. Think about it like this, 50 percent of something is half of it. If you divide 80 by 2 you will get 40! Also you can multiply 80 by the decimal equivalent of 50% which is .5! so 80 * .5 =40!!
g100num [7]3 years ago
3 0
Change percent into decimal which is 0.80 and multiply it by 80 to get 40 which is the answer Also since 50% is half you could just divide 80 by 2
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Answer:

E. 0.11

Step-by-step explanation:

We have these following probabilities:

A 10% probability that a person has the flu.

A 90% probability that a person does not have the flu, just a cold.

If a person has the flu, a 99% probability of having a runny nose.

If a person just has a cold, a 90% probability of having a runny nose.

This can be formulated as the following problem:

What is the probability of B happening, knowing that A has happened.

It can be calculated by the following formula

P = \frac{P(B).P(A/B)}{P(A)}

Where P(B) is the probability of B happening, P(A/B) is the probability of A happening knowing that B happened and P(A) is the probability of A happening.

In this problem, we have that:

What is the probability that a person has the flu, given that she has a runny nose?

P(B) is the probability that a person has the flu. So P(B) = 0.1.

P(A/B) is the probability that a person has a runny nose, given that she has the flu. So P(A/B) = 0.99.

P(A) is the probability that a person has a runny nose. It is 0.99 of 0.1 and 0.90 of 0.90. So

P(A) = 0.99*0.1 + 0.9*0.9 = 0.909

What is the probability that this person has the flu?

P = \frac{P(B).P(A/B)}{P(A)} = \frac{0.1*0.99}{0.909} = 0.1089 = 0.11

The correct answer is:

E. 0.11

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