Find the mean of the following data.
C.I : 0–10 10–20 20–30 30–40 40–50
f : 6 28 51 11 4
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1500 is the mean of continue s series
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Mean = 22.9
Explanation:
Computation of Mean:
Class-inter-well Frequency Mid value
(F) (X) (F × X)
0–10 6 5 30
10–20 28 15 420
20–30 51 25 1275
30–40 11 35 385
40–50 4 45 180
Σf = 100 Σfx = 2,290
Mean = Σfx / Σf
Mean = 2,290 / 100
Mean = 22.9
Note: Mid value = (Upper limit + lower limit)/2
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