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.