In one particular ancient civilization, sword shafts were buried along with bodies in the graves of people of certain standing. The accompanying table gives the results of one study in which the number of shafts buried at each of 19 grave sites were counted.
Estimate the average number of shafts buried all the graves in this civilization's graves using a 95% confidence interval. Enter your answer in interval notation, smaller number first, rounding each number to one decimal place.
Interpret the interval in plain language:
| 4 | 4 | 4 | 4 | 2 | 2 | 4 | 4 |
| 2 | 3 | 2 | 1 | 3 | 3 | 3 | 4 |
| 2 | 2 | 2 |
Estimate the average number of shafts buried all the graves in this civilization's graves using a 95% confidence interval. Enter your answer in interval notation, smaller number first, rounding each number to one decimal place.
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Interpret the interval in plain language: