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18) A drug company claims their new flu vaccine cures 72% of patients. What is the probability that in a family of ve people who take the vaccine? a) None of them get the u? b) Exactly one gets the u? 19) The random variable X is normally distributed with mean 70 and standard deviation 6. a) What is the probability that a value of X chosen at random will be between 65 and 75? 20)A p_opulation of 40 year-old females has a mean salary of $39,321 with a standard deviation of $5,000. If a sample of 100 women is taken: a) What is the probability their mean salaries will be greater than $39,000