A survey of all the students in your school yields the following probability distribution, where X is the number of movies that a selected student has seen in the past week. Number of Movies 0 1 2 3 4 Probability 0.5 0.1 0.1 0.2 0.1 Compute the expected value ? and the standard deviation ? of X. (Round answers to one decimal place.) ?= movies?= movies For what percentage of students is X within two standard deviations of ?? %

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