Suppose a random sample of 400 is selected from a population with a standard deviation of 5. If the sample mean is 25, the 98% confidence interval to estimate the population mean is between
a. 24.34 and 25.68
b. 24.42 and 25.58
c. 24.49 and 25.51
d. 24.76 and 25.25
e. 24.75 and 25.26