Statistics probability

A real estate company is interested in the ages of home buyers. They examined the ages of thousands of home buyers and found that the mean age was years old, with a standard deviation of 11 years. Suppose that these measures are valid for the population of all home buyers. Complete the following statements about the distribution of all ages of home buyers. (a) According to Chebyshev's theorem, at least 84% of the home buyers' X ? ages lie between years and ] years. (Round your answer to the nearest whole number.) (b) According to Chebyshev's theorem, at least (Choose one) v of the home buyers' ages lie between 19 years and 63 years.A nationwide test taken by high school sophomores and juniors has three sections, each scored on a scale of 20 to 80. In a recent year, the national mean score for the writing section was 50.0, with a standard deviation of 9.2. Based on this information, complete the following statements about the distribution of the scores on the writing section for the recent year. OO (a) According to Chebyshev's theorem, at least 36% of the scores lie X ? ED between and . (Round your answer to 1 decimal place.) (b) According to Chebyshev's theorem, at least (Choose one) Y of the scores lie between 31.6 and 68.4