Answer question as a percent rounded to the nearest 100th In

Answer question as a percent rounded to the nearest 100th.

In a family of 10 children, the probability that they are all girls is 0.1%.

(1) What is the probability of at least one boy this family of 10 children?

Solution

Note that

P(at least 1 boy) = 100% - P(all are not boys) = 1 - P(all are girls)

Thus,

P(at least 1 boy) = 100% - 0.1% = 99.9% [answer]