1000 Light Bulbs

by Subodh
(India)

1000 light bulbs with a mean life of 120 days are installed in a new factory and their length of life is normally distributed with a standard deviation of
30 days.

I need the answer & how to solve it.

Thanks'
&
regards

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ANSWER
by: MATHS LEARNER`

1000 light bulbs with a mean life of 120 days are installed in a new factory and their length of life
is normally distributed with a standard deviation of 30 days
ANS : TAKE X PWR 1 =1000
MEU = 120
SD = 30

Z=120-1000/20

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