Supposexhas a distribution with a mean of70and a standard deviation of12. Random samples of sizen=64are drawn.

Compute the mean and standard deviation of the distribution. (For each answer, enter a number.)

=

mu sub x bar =

=

sigma sub x bar =

(b)Find thezvalue corresponding to=73. (Enter an exact number.)

z=

(c)FindP(<73). (Enter a number. Round your answer to four decimal places.)

P(<73) =

P(x bar < 73)