The mean of following distribution is
$x_{i}$
$10$
$12$
$15$
$25$
$f_{i}$
$2$
$3$
$7$
$8$

18.50

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18.05

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18.15

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18.25

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Solution

The correct option is B $18.05$
The mean of the distribution $= \frac{Σ x_{i} f_{i}}{f_{i}}$
$= \frac{10 \times 2 + 12 \times 3 + 15 \times 7 + 25 \times 8}{2 + 4 + 7 + 8}$
$= \frac{361}{20}$
$= 18.05$

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