(a) Find the probability that a single randomly selected value is less than 78.8. Round your answer to four decimal places.
(b) Find the probability that a randomly selected sample of size n = 38 has a mean less than 78.8. Round your answer to four decimal places.
Answer :
Given :
The population mean
The population standard deviation
Solution :
(a) The probability that a single randomly selected value is less than 78.8 :
(b) The probability that a randomly selected sample of size