Finding Probability Xbar?

#1
Suppose a simple random sample of size n = 38 is obtained from a population of Mean = 66 and Standard Deviation = 19

a) P(x-bar < 69.9)
b) P(x-bar (greater than or equal to) 67.6))
 

Martingale

TS Contributor
#2
Suppose a simple random sample of size n = 38 is obtained from a population of Mean = 66 and Standard Deviation = 19

a) P(x-bar < 69.9)
b) P(x-bar (greater than or equal to) 67.6))
Do you know that the distribution of x-bar is?

Once you figure this out standardize x-bar