A bats man scores runs in 10 innings as 38,70,48, 34,42,55,63,46,54 and 44. The mean deviation about mean is

8.6

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6.4

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10.6

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7.6

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Solution

Disclaimer : No option is matching the answer :

$\frac{N}{X} = 10$

= $\frac{38 + 70 + 48 + 34 + 42 + 55 + 63 + 46 + 54 + 44}{10} = \frac{404}{10} = 49.4$

$\begin{matrix} x_{i} & d_{i} = | x_{i} - 49.4 | 34 & 15.4 38 & 11.4 42 & 7.4 44 & 5.4 46 & 3.4 48 & 1.4 54 & 4.6 55 & 5.6 63 & 13.6 70 & 20.6 \sum_{i = 1}^{n} d_{i} = 88.8 \end{matrix}$

Mean devaition from the mean $= \frac{88.8}{10} = 8.88$

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A bats man scores runs in 10 innings as 38,70,48, 34,42,55,63,46,54 and 44. The mean deviation about mean is

Disclaimer : No option is matching the answer : NX=10 = 38+70+48+34+42+55+63+46+54+4410=40410=49.4 xidi=|xi−49.4|3415.43811.4427.4445.4463.4481.4544.6555.66313.67020.6∑ni=1di=88.8 Mean devaition from the mean =88.810=8.88