(c) Of the next 100 adults to use a lawn mower, how many do we expect to be injured? 21. From a survey of elderly persons regarding leisure time physical activity, it was found that 47 percent of the married males exercised three or more times per week. (a) What is the probability out of the next 18 elderly married males selected that at least 10 exercise three or more times per week? (b) What is the probability that no more than 9 exercise three or more times per week? (c) What is the relationship between the two answers given above? Be specific. (d) What is the expected number of elderly married males that exercised three or more times per week