22 random samples were selected from a population that has a normal distribution. The sample has a mean of 99 and a standard deviation of 5. Construct a 95% confidence level for the population standard deviation.

A. 4 < σ < 7

B. 2 < σ < 3

C. 76 < σ < 141

D. 1 < σ < 9

How much money does ron have left each month after his fixed expenses? ron graduated from college five years ago. he recently bought a house, but shares it with a housemate who pays him $800 a month for rent and utilities. ron is putting a budget worksheet together so he will have a better idea of where his money is going and where he can save. enlarge