in a supermarket the failure time of a vending machine is assumed to be a random variables and follow s the normal distribution , if 60 percentage of the the failure occurring symmetrically only between 600 and 700 hours of use , 1.)what is the mean time to failure of a vending machine?
2.)find the variance of the failure time's distribution ?
3.) what is the reliability of the vending machine , if it is used for 590 hours and then replaced ?
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