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>=
Algebra ->
Probability-and-statistics
-> 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>=
Log On
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.
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
