The life time of a particular brand of tires is normally dis

The life time of a particular brand of tires is normally distributed with a mean of 40, 000 miles and a standard deviation of 5,000 miles What is the probability that a randomly selected tire will have a life time of at least 47.500 miles? Refer to exhibit #1. What percentage of tires will have a life time of 34,000 to 46,000 miles? A theorem that allows us to use the normal probability distribution to approximate the sampling distribution of X whenever the sample size is large is known as the

Solution

1) b. Use NORMDIST function in excel and subtact answer with 1.

2) c.

3) b. Use NORMDIST function for both the values and subtract the obtained two values.

4) c.