A Normally Distributed Population with 200 Elements Has a Mean

Multiple Choice

A normally distributed population with 200 elements has a mean of 60 and a standard deviation of 10. The probability that the mean of a sample of 25 elements taken from this population will be smaller than 56 is:

A) 0.0166 .
B) 0.0228 .
C) 0.3708 .
D) 0.0394 .