3.25. For GSS data on "the number of people you know who have committed suicide," 88.8% of the responses were 0, 8.8 % were 1, and the other responses took higher values. The mean equals 0.145, and the standard deviation equals 0.457.

(a) What percentage of observations fall within one standard deviation of the mean?

(b) Is the Empirical Rule appropriate for the dis- tribution of this variable? Why or why not? 3.26. The first exam in your Statistics course is graded on a scale of 0 to 100, and the mean is 76. Which value is most plausible for the standard deviation: -20, 0, 10, or 50? Why?