6.A child's piano practice times are normally distributed with a mean of 24 minutes and a standard deviation of 6 minutes. Using the Empirical Rule, what is the approximate percentage of practice times running between 18 and 30 minutes?

Percentage is

20.Running times in a daily workout have a mean of 38 minutes and a standard deviation of 10 minutes. The distribution is unknown. Using Chebyshev's Rule, in what interval about the mean would you expect to find at least 89% of the workout times?

Interval is-

21.Weights of Old English Sheepdogs are normally distributed with a mean of 58 pounds and a standard deviation of 5 pounds. Using the empirical rule, in what interval about the mean would you expect to find 95% of the weights?

Interval is-