Your candidacy for elected class representative is being opposed by Slick Sally. Your election committee has surveyed six of the students in your class and had them rank Sally on a scale of 0-10. The rankings were 2, 8, 7, 10, 9, 8. (a) Find the sample mean and standard deviation. HINT (See Example 1 and Quick Examples 1 and 2.) (Round your answers to two decimal places.) sample mean standard deviation (b) Assuming that the sample mean and standard deviation are indicative of the class as a whole, in what range does the empirical rule predict that approximately 95% of the class will rank Sally? (Include only practical values in your interval. Round your answers to two decimal places.) What other assumptions must we make to use the rule? The population distribution is bell-shaped and symmetric. The population distribution is symmetric, but not bell-shaped. The population distribution is bell-shaped, but not symmetric. The population distribution is neither bell-shaped nor symmetric