If a random sample of size n 57 is drawn find x sx and p15

Question

Suppose x has a distribution with μ = 15 and σ = 13.

(a) If a random sample of size n = 41 is drawn, find μ_x, σ_x and P(15 ≤ x ≤ 17). (Round σ_x to two decimal places and the probability to four decimal places.)

μ_x =?

σ_x =?

P(15 ≤ x ≤ 17) =?

(b) If a random sample of size n = 57 is drawn, find μ_x, σ_x and P(15 ≤ x ≤ 17). (Round σ_x to two decimal places and the probability to four decimal places.)

μ_x =?

σ_x =?

P(15 ≤ x ≤ 17) =?