Refer to the running-distance data of Exercise 2.6.8. The sample mean is 32.23 m and the SD is 8.07 m. What percentage of the observations are within
(a) 1 SD of the mean?
(b) 2 SDs of the mean?
Exercise 2.6.8
In a study of the lizard Sceloporus occidentals biologists measured the distance (m) run in 2 minutes for each of 15 animals. The results (listed in increasing order) were as follows:

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18.4 22.2 24.5 26.4 27.5 28.7 30.6 32.9 29 34.0 348 37.5 42.145.5 45.5