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Question
The mean of the given frequency distribution is:
| x | 30 | 20 |
| f | 15 | 5 |
Options
\[\frac{30}{15}+\frac{20}{5}\]
\[\frac{30}{15}-\frac{20}{5}\]
\[\frac{550}{20}=27.5\]
\[\frac{50}{20}=2 \cdot 5\]
MCQ
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Solution
\[{\boldsymbol{\frac{550}{20}=27.5}}\]
Explanation:
| x | f | fx |
| 30 | 15 | 450 |
| 20 | 5 | 100 |
| Total | Σf = 20 | Σfx = 550 |
By formula, \[\text{Mean} = \frac{\Sigma fx}{\Sigma f} = \frac{550}{20} = 27.5\]
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