Question

Please if possible in word file or in a file which I can copy. Thanks

1. A 7-Eleven convenience store decided to understand the shopping patterns of its customers and collected a randomly sample 20 purchases from last week’s records (all purchases in U.S. dollars):

39.05	2.73	32.92	47.51
37.91	34.35	64.48	51.96
56.95	81.58	47.8	11.72
21.57	40.83	38.24	32.98
75.16	74.30	47.54	65.62

a) Make a histogram of the data using a Bar width of $20.

b) Make a histogram of the data using a Bar width of $10.

c) Provide the relative frequency for both histogram of $10 and $20 bar width.

Answer 1

a) Frequency distribution with bar width $20

Frequency Table
Class	Frequency
0-20	2
20-40	7
40-60	6
60-80	4
80-100	1

Histogram:

b) Frequency distribution with bar width $10

Frequency Table
Class	Frequency
0-10	1
10-20	1
20-30	1
30-40	6
40-50	4
50-60	2
60-70	2
70-80	2
80-90	1

Histogram:

c) Relative frequency = Frequency of that class/ total frequency

Frequency Table
Class	Relative frequency
0-20	0.10
20-40	0.35
40-60	0.30
60-80	0.20
80-100	0.05

Frequency Table
Class	Relative frequency
0-10	0.05
10-20	0.05
20-30	0.05
30-40	0.30
40-50	0.20
50-60	0.10
60-70	0.10
70-80	0.10
80-90	0.05