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Age Range Percent of Individuals Invested in Stock Market 18 to 29 30 to 49 50 to 64 65+ 54 Suppose Gallup wishes to complete a follow-up survey to find out more about the specific type of stocks people in the United States are purchasing. (a) What is the smallest number of 18-to 29-year-olds that must be sampled to expect to find 60 who invest in the stock market? (Round your answer up to the nearest person.) (b) What is the smallest number of people 65 years of age and older that must be sampled to expect to find 60 who invest in the stock market? (Round your answer up to the nearest person.) (c) If 2,000 individuals 18- to 29-years-old are randomly sampled, what is the expected number of 18- to 29-year olds who invest in the stock market in this sample? What is the standard deviation of the number of 18- to 29-year-olds who invest in the stock market? (Round your answers to two decimal places.) E(x) = (d) If 2,000 individuals 65 years of age and older are randomly sampled, what is the expected number of those 65 and older who invest in the stock market in this sample? What is the standard deviation of the number of those 65 years of age and older who invest in the stock market? ( Round your answers to two decimal places.) E(X) =