Question 905438
a)
z= (.30-.36)/sqrt[ .36*.64/200] = -.06/.0339 = -1.7699
z = (.40-.36)/sqrt[ .36*.64/200] = .04/.0339 = 1.1799
P(.30 < x-bar > .40) = NORMSDIST(1.1799) - NORMSDIST(-1.7699)
b)z = NORMINV(.95) = (X-.36)/.0039
.0039NORMSINV(.95) + .36 = upper bound
.0039NORMSINV(.05) + .36 = lower bound
c) 
.0039NORMSINV(.925) + .36 = upper bound
.0039NORMSINV(.025) + .36 = lower bound