A population of values has a normal distribution with

=

155.9

=

155.9

and

=

67.2

=

67.2

. You intend to draw a random sample of sizen

=

20

n

=

20

.

Find the probability that a single randomly selected value is less than 112.3.

P(X< 112.3) =

Find the probability that a sample of sizen

=

20

n

=

20

is randomly selected with a mean less than 112.3.

P(M< 112.3) =