Suppose x has distribution with u=18 and standard deviation =13

6. [-/0.22 Points] DETAILS BBUNDERSTAT12 6.5.011.S. MY NOTES ASK YOUR TEACHER Suppose x has a distribution with # = 18 and o = 13. LA USE SALT (a) If a random sample of size n = 49 is drawn, find u-, o - and P(18 s x S 20). (Round ay to two decimal places and the probability to four decimal places.) P(18 S x S 20) = (b) If a random sample of size n = 72 is drawn, find #, o - and P(18 s x $ 20). (Round o - to two decimal places and the probability to four decimal places.) P(18 S x S 20) = (c) Why should you expect the probability of part (b) to be higher than that of part (a)? (Hint: Consider the standard deviations in parts (a) and (b).) The standard deviation of part (b) is -Select- |part (a) because of the -Select-| sample size. Therefore, the distribution about , is -Select- Need Help? Read It Watch It