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Question
Obtain the mean of the following distribution:
| Frequency | Variable |
| 4 | 4 |
| 8 | 6 |
| 14 | 8 |
| 11 | 10 |
| 3 | 12 |
Solution
As we know that:
Mean of the data `(barx) = (sum_(i = 1)^n f_ix_i)/(sum_(i = 1)^n f_i)`
= `(4 xx 4 + 8 xx 6 + 14 xx 8 + 11 xx 10 + 3 xx 12)/(4 + 8 + 14 + 11 + 3)`
= `(16 + 48 + 112 + 110 + 36)/40`
= `322/40`
= 8.05
Hence, the mean of the given data set is 8.05.
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