The probability of waiting 4 minutes or longer for checkout at a particular supermarket counter is 0.1. On a given day, a man an
d his wife decide to shop individually at the market, each checking out at different counters. They both reach the counters at the same time.
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Answer: The probability that a randomly selected tire will have a tread-life of less than 65,000 miles is 0.7872 .
Step-by-step explanation:
The cumulative distribution function for exponential distribution is :-
, where
is the mean of the distribution.
As per given , we have
Average tread-life of a certain brand of tire :
Now , the probability that a randomly selected tire will have a tread-life of less than 65,000 miles will be :
Hence , the probability that a randomly selected tire will have a tread-life of less than 65,000 miles is 0.7872 .