The frequency distribution below shows the distribution for checkout time (in minutes) in UMUC MiniMart between 3:00 PM and 4:00 PM on a Friday afternoon.
|
Checkout Time (in minutes)
|
Frequency
|
|
1.0 - 1.9
|
5
|
|
2.0 - 2.9
|
3
|
|
3.0 - 3.9
|
7
|
|
4.0 - 4.9
|
3
|
|
5.0 - 5.9
|
2
|
1. What percentage of the checkout times was less than 4 minutes?
2. Calculate the mean of this frequency distribution.
3. In what class interval must the median lie? (You don't have to find the median)
4. Assume that the smallest observation in this dataset is 1.2 minutes. Suppose this observation were incorrectly recorded as .2 instead of 1.2 minutes.
Will the mean increase, decrease, or remain the same?
Will the median increase, decrease or remain the same?