The price of a particular brand of jeans has a standard deviation of $10. A sample of 64 pairs of jeans from this brand is selected and the average price for the sample is calculated. Assume the population of prices for this brand of jeans can be considered infinite.

1.What is the standard deviation of the sample average?

1.428

1.25

1.5859

10

2.What is the probability that the average price in the sample will be within plus or minus 2 of the population mean?

0.9987

0.9544

0.8904

0.8579

3.What is the minimum sample size needed if we want the standard deviation of the sample mean to be 1.101 or less?

97

83

76

75