8. The daily sales at a convenience store produce a distribution that is approximately normal with a mean of 1170 and a standard deviation of 141. In your intermediate calculations, round z-values to two decimal places.

The probability that the sales on a given day at this store are more than

1405, rounded to four decimal places, is: .

The probability that the sales on a given day at this store are less than

1305, rounded to four decimal places, is: .

The probability that the sales on a given day at this store are between

1200 and

1300, rounded to four decimal places, is: .

10. A sample of size 80 from a population having standard deviation

= 51 produced a mean of 251.00. The 95% confidence interval for the population mean (rounded to two decimal places) is:

The lower limit is

The upper limit is