Managing for Quality and Performance Excellence 10th Edition by James Evans ,William Lindsay

تمرين 2

Note: Data sets for many problems in this chapter are available in the Excel workbook C06Data.xlsx on the Student Companion Site. Click on the appropriate worksheet tab as noted in the problem (e.g., Prob. 6-1) to access the data. In addition, the spreadsheet templates illustrated in the chapter are also available to aid in solving many of these problems.
The dimension of a machined part made by Perfection Machining, Inc. has a nominal specification of 7.6 cm. The process that produces the part can be controlled to have a mean value equal to this specification, but has a standard deviation of 0.3 cm. What is the probability that a part will have a dimension
a. exceeding 8.1 cm?
b. between 7.6 and 7.95 cm?
c. less than 7.25 cm?