The following table summarizes the amount of time customers had to wait in line at a...
The following table summarizes the amount of time customers had to wait in line at a bank:
| Wait Time | # customers |
| 1 min | 7 |
| 2 min | 8 |
| 3 min | 6 |
| 4 min | 3 |
| 5 min | 2 |
| 6 or more min | 9 |
If a customer is selected at random, what are the probabilities that:
a) The wait time is over 3 minutes
b) The wait time is exactly 2 minutes
c) The wait time is at least 2 minutes
Homework Answers
Total number of customers = 35
a) Number of customers with wait time over 3 minutes = 3+2+9 = 14
Probability = 14/35 = 0.4
b) Number of customers with wait time exactly 2 minutes = 8
Probability = 8/35 = 0.22857
c) Number of customers with wait time at least 2 mins = No. of customers with wait time of 2 or more than 2 mins = 8+6+3+2+9 = 28
Probability = 28/35 = 0.8
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