Question

For 200 births, the probability of exactly 90 girls is 0.0208 and the probability of 90 or fewer girls is 0.089. • is exactly 90 girls in 200 births unlikely? • among 200 births, is 90 girls an unusually low number of girls?

Answer 1

The likelihood of exactly 90 girls in 200 births is 0.0208. Since this probability is lower than 0.05, this is an unlikely event. To see whether 90 girls is an unusually low number of girls, we need to think about the probability of having 90 or fewer girls. Since P(90 or fewer girls) = 0.089>0.05, this is not an unusually low number of girls.