Question

The weight (x grams) of a rose is assumed to be distrubuted as N (5, 12.4). A rose is selected randomly .find the probability that the weight of randomly selected flower is less than 4 gram

Answer 1

$P(X<4)=P(Z<\frac{4-5}{\sqrt{12.4}})=P(Z<-0.28)=0.3897.$