The probability that a twelve year old has a brother or sister is 25%. suppose you survey 300 twelve year olds. about how many do you think will have a brother or sister?

n(B U S) = 75

Step-by-step explanation:

Explanation:-

Probability:-

P(E) =

Let 'B' be the event of having twelve year old brother

Let 'S' be the event of having twelve year old sister

given data  P(BUS) = 0.25

given total survey  n(survey) = 300

we have to find the value is n(BUS) =?

we will use probability definition we get, P( BUS) =

substitute given values, we will get solution

after cross multiplication , we get

n(BUS) = 0.25 X 300

n(BUS) = 75

21

jk it's 20

step-by-step explanation:

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step-by-step explanation:

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