The Friends of the Psychics network charges $3 per minute to learn the secrets that can turn your life around. The network charges for whole minutes only and rounds up to benefi t the company. Thus, a 2 minute 10 second call costs $9. Below is a list of 15 randomly selected charges.
| 3 | 9 | 15 | 21 | 42 | 30 | 6 | 9 | 6 | 15 | 21 | 24 | 32 | 9 | 12 |
- Find the mean of the sample.
- Find a point estimate of the variance of the population.
- Can this sample be used to estimate the average length of a call? If so, what is your estimate? If not, what can we estimate using this sample?
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