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When tested the lives (in hours) of 5 b...

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

A

178

B

179

C

220

D

356

Text Solution

Verified by Experts

The correct Answer is:
A
Since the lives of 5 bulbs are 1357,1090,1666,1494 and 1623
`therefore " mean " =( 1357+1090+1666+1494 + 1623 )/(5)`
`=(7230)/(5)=1446`

`MD=(Sigmad_(i))/(N)=(890)/(5)=178`
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