1.29 How Long Is the Line? To decide on the number of service counters needed for stores to be built in the future, a supermarket chain wanted to obtain information on the length of time (in minutes) required to service customers. To find the distribution of customer service times, a sample of 1000 customers' service times was recorded. Sixty of these are shown here:

a. Construct a stem and leaf plot for the data.

b. What fraction of the service times are less than or equal to 1 minute?

c. What is the smallest of the 60 measurements?

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3.6 1.9 2.1 0.3 0.8 0.2 1.0 1.4 1.8 1.6 1.1 1.8 0.3 1.1 0.5 1.2 0.6 1.1 0.8 1.7 1.4 0.2 1.3 3.1 0.4 2.3 1.8 4.5 0.9 0.7 0.6 2.8 2.5 1.1 0.4 1.2 0.4 1.3 0.8 1.3 1.1 1.2 0.8 1.0 0.9 0.7 3.1 1.7 1.1 22 1.6 1.9 5.2 0.5 1.8 0.3 1.1 0.6 0.7 0.6