Bill has 2/3 of his pizza left from lunch. if he eats 3/7 more of the pizza, how much pizza is left? a.1/4 b.1/3.c.1/21 d.5/21

Arandom sample of 45 observations results in a sample mean of 68. the population standard deviation is known to be 23 a. compute the margin of error at a 959% confidence interval. b. compute the 95% confidence interval for the population mean c. compute the 90% confidence interval for the population mean. d. compute the 75% confidence interval for the population mean