Question

The Quick Change Oil Company has a number of outlets. The numbers of oil changes at...

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:

56 54 35 55 33 46 44 32 57 78
42 42 71 52 75 43 55 45 54 74

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.)

  Units     Frequency Relative frequency
  30 to under 40
  40 to under 50
  50 to under 60
  60 to under 70
  70 to under 80
  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  .

Homework Answers

Answer #1

a) Minimum value = 32 and maximum value = 78

Difference = 78 - 32 = 46

Recommended number of classes = 5 each with interval = 10

b) suggested class interval = 10

c) Lower limit for first class = 30

d)

Units Frequency Relative Frequency
30 to under 40 3 0.15
40 to under 50
6 0.30
50 to under 60 7 0.35
60 to under 70 0 0
70 to under 804 4 0.20
Total 20 1.00

e) The shape of the distribution is almost right skewed.

The greatest concentration is in classes 30 to under 60.

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