A population of values has a normal distribution with = 144 =144 and = 34 =34 . You intend to draw a random sample of sizen = 18 n=18 .
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Question

A population of values has a normal distribution

with μ

=

144

μ=144

 and σ

=

34

σ=34

. You intend to draw a random sample of size n

=

18

n=18

.


Find the probability that a single randomly selected value is less than 154.4.

P(X < 154.4) = 


Find the probability that a sample of size n

=

18

n=18

 is randomly selected with a mean less than 154.4.

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