Delco Products a division of General Motors produces a bracket
Delco Products, a division of General Motors, produces a bracket that is used as part of a power doorlock assembly. The length of this bracket is constantly being monitored. A sample of 30 power door brackets had the following lengths (in millimeters):
a. Without doing any calculations, what would you estimate for the sample mean?
b. Construct an ungrouped frequency distribution.
c. Draw a histogram of this frequency distribution.
d. Use the frequency distribution and calculate the sample mean and standard deviation.
e. Determine the limits of the  ± 3s. interval and mark this interval on the histogram.
f. The product specification limits are 11.7–12.3. Does the sample indicate that production is within these requirements? Justify your answer.
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