Suppose X has a distribution with μ = 12 and σ = 7. (a) If a random sample of size 45 is drawn, find P(12 < X < 14) and P(12 < X < 14). (Round to two decimal places for the mean and to four decimal places for the probability):
P(12 < X < 14) =
(b) If a random sample of size is drawn, find Hx, σx, and P(12 < X < 14). (Round to two decimal places for the mean and to four decimal places for the probability):
Hx =
σx =
P(12 < X < 14) =