A random sample of 50 CSCC students has a mean GPA of 2. It is known that the population standard deviation for the GPA of all CSCC students is 1.

1. A random sample of 50 CSCC students has a mean GPA of 2.55. It is known that the population standard deviation for the GPA of all CSCC students is 1.1. Use this information to complete the following: a) Does the information above provide an estimate of a population mean or a population proportion? b) Construct and interpret a 95% confidence interval for the parameter you selected in part (a

i just want to know how to calculate b