The Pizza Distribution Authority (PDA) has developed quite a business in Carrboro by delivering pizza orders promptly. PDA guarantees that its pizzas will be delivered in 30 minutes or less from the time the order was placed, and if the delivery is late, the pizza is free. The time that it takes to deliver each pizza order that is on time is recorded in the Official Pizza Time Book (OPTB), and the delivery time for those pizzas that are delivered late is recorded as 30 minutes in the OPTB. Twelve random entries from the OPTB are listed.
| 15.3 | 29.5 | 30.0 | 10.1 | 30.0 | 19.6 |
| 10.8 | 12.2 | 14.8 | 30.0 | 22.1 | 18.3 |
- Find the mean for the sample.
- From what population was this sample drawn?
- Can this sample be used to estimate the average time that it takes for PDA to deliver a pizza? Explain.
Solution
