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Question
The mean of data, represented by given diagram, is:
Options
53
47
42
51
MCQ
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Solution
47
Explanation:
Table from the given graph is:
| C.I. | Class mark (x) | Frequency (f) | fx |
| 40-50 | 45 | 40 | 1800 |
| 50-60 | 55 | 10 | 550 |
| Total | Σf = 50 | Σfx = 2350 |
By formula,
\[\text{Mean} = \frac{\Sigma fx}{\Sigma f} = \frac{2350}{50} = 47\]
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