I need help!

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 47 years old, with a standard deviation of 12 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 I. According to Chebyshey's theorem, at least of the home buyers' ages lie between 23 years and 71 years. II. According to Chebyshey's theorem, at least of the home buyers' ages lie between 29 years and 65 years. III. Suppose that the distribution is bell-shaped. According to the empirical rule, approximately ofthe home buyers' ages lie between 23 years and 71 years. IV. Suppose that the distribution is bell-shaped. According to the empirical rule, approximately 99.7% of the home buyers' ages lie between years and years