Age at diagnosis for each of 20 patients under treatment formeningitis was given in a research paper. Suppose the ages (inyears) were as follows.
| 18 | 18 | 27 | 19 | 23 | 20 | 66 | 18 | 21 | 18 | 20 | 18 |
| 18 | 20 | 18 | 19 | 28 | 16 | 18 | 18 | | | | |
(a)
Calculate the values of the sample mean and the standarddeviation. (Round your standard deviation to three decimalplaces.)
sample mean =
rstandard deviation =
(b)
Compute the upper quartile, the lower quartile, and theinterquartile range.
upper quartile=
lower quartile =
interquartile range =
(c)
Are there any mild or extreme outliers present in this data set?(Enter your answers as comma-separated lists. If there is noanswer, enter NONE.)
mild outliers=
extreme outliers=
