(a) Approximately what percentage of these vehicle speeds were between 43 and 65 mph? Recall that per the Empirical Rule, if a data distribution is mound shaped and approximately symmetric, then: . Approximately 68% of the observations fall within 1 standard deviation of the mean. . Approximately 95% of the observations fall within 2 standard deviations of the mean. . Approximately 99.7% of the observations fall within 3 standard deviations of the mean. For this data distribution, it is given that the mean and standard deviation are x = 54 and s = 11. To find the approximate percentage of the vehicle speeds that were between 43 mph and 65 mph, first calculate how far 43 mph and 65 mph are from the mean. distance between the lower value and the mean - 54 Enter an exact number. distance between the mean and the upper value = 54