Age at diagnosis for each of 20 patients under treatment for meningitis was given in a research paper. Suppose the ages (in years) 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 standard deviation. (Round your standard deviation to three decimal places.)
sample mean =
rstandard deviation =