39. The distribution of the age at which all married male BYU students got married is right skewed with = 22.9 years and = 1.5 years. What is the probability that an SRS of 75 married male BYU students would have a sample mean between 22.8 and 23.0? a. .281 b. .438 c. .056 d. .562 e. .680 f. Cant compute using the standard Normal table because the distribution is right skewed, not Normal.

40. Referring to question 39, what is the standard deviation of the sampling distribution of x-bar for samples of size 75? a. 1.5 years b. 0.17 years c. 0.02 years d. Cannot be determined from information given.

#39 makes sense to me, but I don't know how to do #40. I know that the answer is B. 0.17 years but I don't know how to do the math to obtain that answer, can someone please explain?