SOLUTION: Consider the following grouped frequency distribution, which portrays the duration (in minutes) of 50 lectures delivered by a Chemistry professor. Duration (Minutes) Frequency

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Question 1176386: Consider the following grouped frequency distribution, which portrays the duration (in minutes) of 50 lectures
delivered by a Chemistry professor.
Duration (Minutes) Frequency
30.00 < 40.00 3
40.00 < 50.00 7
50.00 < 60.00 18
60.00 < 70.00 13
70.00 < 80.00 8
80.00 < 90.00 1

Using computational formulae, calculate the:
(i) estimated mean.
Found 2 solutions by Solver92311, ewatrrr:
Answer by Solver92311(821) About Me  (Show Source):
You can put this solution on YOUR website!


To calculate the estimated mean: Find the midpoint of each interval. Multiply the midpoints by the associated frequencies. Add the products. Divide the sum by the total number of data observations (sum of the frequency numbers).

John

My calculator said it, I believe it, that settles it

From
I > Ø

Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!





Using an Excel Spreadsheet:(takes less than a minute)

35	3	105

45	7	315

55	18	990

65	13	845

75	8	600

85	1	85

	50	2940

M = 2940/50 = 58.8