A certain type of device lasts on average 6 years with a variance of 4 years....
A certain type of device lasts on average 6 years with a variance of 4 years. assume the device life is normally distributed. find:
1- the probability that the device will lasts between 2 and 3 years
2- the probability that the device will lasts less than 10 years
3- find a value d such that the device life is in the range of 7 ± d with probability of 0.08076 (explain this point carefully)
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