Determine the mean of the following distribution: Marks No. of students Below 10 5 Below 20 9 Below 30 17 Below 40 29 Below 50 45 Below 60 60 Below 70 70 Below 80 78 Below 90 83 Below 100 85
Answers
Answer:
48.4
Step-by-step explanation:
Mark Cumulative Group Mean Mean * Frequency
0-10 5 5 5 25
10-20 9 4 15 60
20-30 17 8 25 200
30-40 29 12 35 420
40-50 45 16 45 720
50-60 60 15 55 825
60-70 70 10 65 650
70-80 78 8 75 600
80-90 83 5 85 425
90-100 85 2 95 190
85 4115
Mean = 4115/85 = 48.4
Step-by-step explanation:
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