A random sample of 64 items is selected from a population of 400 items. The sample mean is 200. The population standard deviation is 48. From this data, a 90% confidence interval to estimate the population mean can be calculated as _______.

Select one:

a.190.94 to 209.06

b.189.21 to 210.79

c.190.13 to 209.87

d.188.24 to 211.76