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.

Transcribed Image Text:

11.86 11.88 11.88 119T 11.88 T1.88 1188 11.88 11.8811.86 11.88 11.88 11.88 11.88 11.86 1183 11.86 11.8611.88 11.88 11.88 11 83 11.86 11.86 11.86 T1.88 T 88 11.86 11.88 11.83