Class interval: | 0-10 | 10-12 | 20-30 | 30-40 | 40-50 |
Frequency: | 9 | 12 | 15 | 10 | 14 |
Let the assumed mean (A) = 25
Class interval | Mid value (xi) | di = xi - 25 | ui = | Frequency (fi) | fiui |
0 – 10 | 5 | -20 | -2 | 9 | -18 |
10 – 20 | 15 | -10 | -1 | 12 | -12 |
20 – 30 | 25 | 0 | 0 | 15 | 0 |
30 – 40 | 35 | 10 | 1 | 10 | 10 |
40 – 50 | 45 | 20 | 2 | 14 | 28 |
N = 60 | ∑fiui = 8 |
We have, A = 25
h = 10
Mean = A + h * 
= 25 + 10 * 
= 25 + 
= 25 + 
= 26.333
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