1. A particular manufacturing design requires a shaft with a diameter between 19.87mm and

20.010mm. The manufacturing process yields shafts with diameters normally distributed, with a mean of 20.002mm and a standard deviation of 0.005mm. 2. One year consumers spent an average of $23 on a meal at a resturant. Assume that the amount spent on a resturant meal is normally distributed and that the standard deviation is $4.

3. A trucking company determined that the distance traveled per truck per year is normally distributed, with a mean of 80 thousand miles and a standard deviation of 12 thousand miles.

1. c. For this process what is the diameter that will be exceeded by only 2.5% of the shafts

2. c.What is the probability that a randomly selected person spent between $13 and $22

3. c. How many miles will be traveled by at least %75 of the trucks?