Refer to the following frequency distribution for Questions 2, 3, 4, and 5. Show all work. Just the
answer, without supporting work, will receive no credit.
A random sample of 25 customers was chosen in UMUC MiniMart between 3:00 and 4:00 PM on a Friday afternoon. The frequency distribution below shows the distribution for checkout time (in minutes).
Checkout Time (in minutes) Frequency Relative Frequency
Checkout Time (in minutes)
|
Frequency
|
Relative Frequency
|
1.0 - 1.9
|
6
| |
2.0 - 2.9
|
8
| |
3.0 - 3.9
| ||
4.0 - 5.9
|
5
| |
Total
|
25
|
2. Complete the frequency table with frequency and relative frequency. (5 pts)
3. What percentage of the checkout times was less than 3 minutes? (5 pts)
4. In what class interval must the median lie? Explain your answer. (5 pts)
5. Assume that the largest observation in this dataset is 5.8. Suppose this observation were
incorrectly recorded as 8.5 instead of 5.8. Will the mean increase, decrease, or remain
the same? Will the median increase, decrease or remain the same? Why? (5 pts)
