what is the mean deviation of 18 19 20 21 frequency 5 10 40 45?
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Step-by-step explanation:
Xi f c.f ∣Xi−M∣ fi×∣Xi−M∣
10 7 7 20 140
15 3 10 15 45
20 8 18 10 80
25 5 23 5 25
30 6 29 (Median Class) 0 0
35 8 37 5 40
40 4 41 10 40
45 9 50 15 135
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