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Question 20 (5 points) A water supplying company wished to estimate the average amount the private customers pay per month. A random sample of 25

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Question 20 (5 points) A water supplying company wished to estimate the average amount the private customers pay per month. A random sample of 25 customers' bills produced a sample mean of $30 and a sample standard deviation of $5. c) Find a 90% confidence interval for the mpulation mean. 27.20 g p, g 29.71 32.29 g p, g 33.71 28.29 g p, g 31.71

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