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Unformatted text preview: Business and Economics Statistics I Name: ______________________ Homework #6 Class Time: __________________ Due October 9 1. An industrial sewing machine uses ball bearings that are targeted to have a diameter of 0.75 in. The specification limits under which the ball bearings can operate are 0.74 in. (lower) and 0.76 in. (upper). Past experiences has indicated that the actual diameter is approximately normally distributed with a mean of 0.753 in. and a standard deviation of .004 in. What is the probability that a randomly selected ball bearing will be: a. Between the target and the actual mean? Ans _____________ b. Between the lower specification limit and the target? Ans _____________ c. Above the upper specification limit? Ans _____________ d. Below the lower specification limit? Ans _____________ e. Above which value in diameter will 93% of the ball bearings be? Ans _____________ 2. Commuting time for students at an urban college has been found to be normally distributed with a mean of 45 minutes and a standard deviation of 15 minutes.be normally distributed with a mean of 45 minutes and a standard deviation of 15 minutes....
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- Fall '07