SOLUTION: light bulbs having a mean life of 1260 hours and the standard deviation is 140 hours are used for a consignment of sample of 100 bulbs.
let x is the life time of a bulb find P(x>=
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Question 879653: light bulbs having a mean life of 1260 hours and the standard deviation is 140 hours are used for a consignment of sample of 100 bulbs.
let x is the life time of a bulb find P(x>=1300) and estimate the number of bulbs.
Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!
Population: mean = 1260, sd = 140, sample of 100
*Note:
z = 40/(140/sqrt(100)) = 40/14 = 2.8574
P(x>=1300)= 1 - P(z<1300) = .0021 0r .21%
E = .0021*100 = .21 bulbs , basically none
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