A random sample of nine telephone calls in an office provided the following information. Duration (In Minutes) Call Number 1 2 3 4 5 6 7 8 9 3 8 4 2 5 6 2 6 9 Type of Call long distance long distance long distance local local long distance local long distance long distance (a) Determine the point estimate for the average duration (in minutes) of all calls. min (b) What is the point estimate for the standard deviation (in minutes) of the population? min (c) Determine the standard error (in minutes) of the mean. (Round your answer to three decimal places.) min (d) What is the point estimate for the proportion of all calls that were long distance? (Round your answer to three decimal places.) (e) Determine the standard error of proportion. (Round your answer to three decimal places.)

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