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When tested, the lives (in hours) of 5 bulbs were noted as follows:
1357, 1090, 1666, 1494, 1623
The mean deviation (in hours) from their mean is

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178

179

220

356

answer is A.

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Detailed Solution

The lives of 5 bulbs are: 1351 , 1090, 1666, 1494, 1623

$\begin{aligned} Mean (\bar{x}) = \frac{1357 + 1090 + 1666 + 1494 + 1623}{5} \\ = \frac{7230}{5} = 1446 \end{aligned}$

$M.D. = \frac{Σ d_{i}}{N} = \frac{890}{5} = 178$

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