1: From a sample with n = 36, the mean duration of a geyser's eruptions is 3.77 minutes and the standard deviation is 0.62 minutes. Using Chebychev's Theorem, determine at least how many of the eruptions lasted between 2.43 and 5.11 minutes. Question 2: Use the Empirical Rule. The mean speed of a sample of vehicles along a stretch of highway is 64 miles per hour, with a standard deviation of 5 miles per hour. Estimate the percent of 54 miles per hour and 74 miles per hour. (Assume the data set has a bell -shaped distribution.)