Find the indicated measures of central tendency.

Mean of the miles traveled in Exercise 15

Data from Exercises 15 of Exercises 22.1

Use the following data. In testing a new electric engine, an automobile company randomly selected 20 cars of a certain model and recorded the range (in mi) that the car could travel before the batteries needed recharging. The results are shown below.

143, 148, 146, 144, 149, 144, 150, 148, 148, 144
153, 146, 147, 146, 147, 149, 145, 151, 149, 148

Using the classes 141−44, 144 −147, . . . , 153−156, form a frequency distribution table. Use the convention that the left endpoint is included in each class, but not the right endpoint.