Question: Can someone explain and solve this question for me ? Sure Stone Tire Company has established that the useful life of a particular brand of

Can someone explain and solve this question for me ?

Sure Stone Tire Company has established that the useful life of a particular brand of its automobile

tires is normally distributed with a mean of 40,000 miles and a standard deviation of 5,000 miles.

a. What is the probability that a randomly selected tire of this brand has a life of at least

42,500miles?

b. What is the probability that the average life of randomly selected 20 tires of this brand is at least

42,500miles?

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