Characteristics of antiwar demonstrators. The characteristics of antiwar demonstrators in the United States were examined in the American Journal of Sociology

(Jan. 2014). Using data collected for over 5,000 antiwar demonstrators over a recent 3-year period, the researchers found that the mean number of protest organizations joined by the demonstrators was .90 with a standard deviation of 1.10.

a. Give an interval that captures the number of protest organizations joined for at least 75% of the demonstrators.

b. One of the antiwar demonstrators had joined 7 protest organizations. Is this typical of the sample of antiwar demonstrators? Explain.