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How many children is it possible to have at once?

A major problem with multiple births is the survival of the children. In October 2009, the Suleman octuplets (8 children) were born in California and they were still doing well at the age of 5.


A child was born into a family each year for five consecutive years What is the variance of the ages of the children?

The age variance is 2.5


A women is going to have 6 children What is the probability that all 6 will be boys?

if we assume that the probability for a girl being born is the same as a boy being born: (1/2)^6 = 0.015625 = 1.5625%


What is the probability that a couple with three children will have at least one girl?

The individual probability that a child born will be female is 50% or 0.5.Using this we can calculate the probability that at least one of the children will be female by:calculating the probability that none of the children will be female and then subtracting this from 1.The probability that all the children are male is therefore 0.53 = 0.5 * 0.5 * 0.5 = 0.125.Thus the answer is 1 - 0.125 = 0.875 = 87.5%


What is the probability that in this family the first child born is a boy and the last child born is a girl of four children?

There is no simple answer to the question because the children's genders are not independent events. They depend on the parents' ages and their genes. However, if you assume that they are independent events then, given that the probability of a boy is approx 0.5169, the probability of the event described is 0.5169*1*1*0.4831 = 0.2497

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