Find mean mide median for class interval 45-55 55-65 65- 75 75-85 85-95 frequency 3,10,11,8,3
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45-55 3 50 150
55-65 10 60 600
65-75 11 70 770
75-80 8 80 640
85-90 3 90 270
35 2430
=2430÷35=69.42
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