The Quick Change Oil Company has a number of outlets The num

The Quick Change Oil Company has a number of outlets. The numbers of oil changes at the Oak Street outlet in the past 20 days are as follows 47 85 48 51 61 72 86 75 54 83 86 57 57 80 76 72 62 The data are to be organized into a frequency distribution a. How many classes would you recommend? b. What class interval would you suggest? (Round the final answer to the nearest whole number.) c. What lower limit would you recommend for the first class? d. Organize the information into a frequency distribution and determine the relative frequency distribution. (Round the final answers to 2 decimal places.) Relative frequency Units 40 to under 50 50 to under 60 60 to under 70 70 to under 80 80 to under 90 Frequency Total e. Comment on the shape of the distribution. (Enter the intervals in ascending order.) The greatest concentration is in classes up to and up to

Solution

1). 5 classes is recommended since the data contains figures in 40s, 50s, 60s, 70 and 80s

2). Class intervals of 10 is suggested

3). Lower limit for the first class should be 40

4).

4

   Total - 20 1

80 to 90 has the greatest concentration, followed by 70 to 80

40 to under 50	3	0.15
50 to under 60	4	0.2
60 to under 70	2	0.1
70 to under 80	5	0.25
80 to under 90	6	0.3