USA Today reported that about 20% of all people in the United States are illiterate. Suppose you take eight people at random off a city street. A button hyperlink to the SALT program that reads: Use SALT. (a) Find the mean and standard deviation of this probability distribution. (Round your answers to two decimal places.) = 1.6 Correct: Your answer is correct. people = 1.13 Correct: Your answer is correct. people Find the expected number of people in this sample who are illiterate. (Round your answer to two decimal places.) 1.6 Correct: Your answer is correct. people (b) How many people would you need to interview to be 87% sure that at least seven of these people can read and write (are not illiterate)? (Enter the smallest number of people needed to be at least 87% sure.) Incorrect: Your answer is incorrect. people