LICLL FILE. A random sample of 9 telephone calls in an office provided the following information: Call Number Duration (minutes) Type of Call 1 local long distance 3 4 local 4. 3 local 5 long distance 6. 6. local 7 3 local local 9. 8 local а. Determine the point estimate for the average duration of all calls. b. What is the point estimate for the standard deviation &f the population? c. What is the point estimate for the proportion of all calls that were long distance?

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