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1.Suppose a manufacturing company makes a certain item. The time to produce each item is normally distributed around a mean of 27 minutes with a standard deviation of 2.5 minutes. Thus, the population of production times is normal in shape. Find the mean and standard deviation of the sample. Sample size is 100.

2.The average prices for a product in 12 stores in a city are shown below.

$2.99, $2.85, $3.25, $3.55, $3.00, $2.99, $2.76, $3.50, $3.20, $2.85, $3.75, $3.85

Test the hypotesis that the average price is higher than $2.87. Use level of significance a = 0.05

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