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: 1357,1090, 1666, 1494, 1623 Mean (x¯)=1357+1090+1666+1494+16235=72305=1446 M.D. =ΣdiN=8905=178

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