Recall that Table 1.8 presents the waiting times for teller service during peak business hours of 100 randomly selected bank customers. Figure 2.16 gives the MINITAB output of a histogram of these waiting times that has been constructed using automatic classes.

a. Describe where the waiting times seem to be concentrated.
b. Describe and interpret the shape of the distribution of waiting times.
c. What is the class length that has been automatically defined by MINITAB?
d. Write out the automatically defined classes and construct a cumulative percent frequency distribution of the waiting times using these classes.

Transcribed Image Text:

TABLE 1.8 Waiting Times (in Minutes) for the Bank Customer Waiting Time Case 1.6 6.2 6.6 54 5.6 4.9 3.2 5.6 7.9 6.5 4.4 1.1 7.2 7.3 2.3 4.5 7.2 10.7 4.1 6.1 3.8 5.4 .8 8.7 67 2.9 4.7 8.1 9.1 3.6 43 7.7 3.9 4.6 2.5 6.5 8.3 6.4 8.6 6.3 4.2 5.8 3.4 9.3 10.9 7.4 1.8 7.5 6.7 7.0 3.5 5.3 6.3 4.5 4.3 4.5 3.8 1.8 5.1 3.7 5.5 4.0 5.7 2.4 9.2 5.0 2.7 3.7 2.2 5.8 4.0 6.1 4 8.67.8 6.8 10.2 2.05.2 2.8 8.0 8.4 11.6 9.5 6.3 4.3 1.3 4.4 4.8 5.2 9.9 7.4 9.8 2.9 34 9 3.1 5.8 3.9