Question

In your bid to be elected class representative, you have your election committee survey five randomly chosen students in your class and ask them to rank you on a scale of 0-10. Your rankings are 9, 6, 8, 8, 4. (a) Find the sample mean and standard deviation. (Round your answers to two decimal places.) HINT [See Example 1.] sample mean standard deviation (b) Assuming the sample mean and standard deviation are indicative of the class as a whole, in what range does the empirical rule predict that approximately 68% of the class will rank you? , What other assumptions must we make to use the rule? The population distribution is neither bell-shaped nor symmetric. The population distribution is symmetric, but not bell-shaped. The population distribution is bell-shaped, but not symmetric. The population distribution is bell-shaped and symmetric.

Answer 1