QUESTION 15 (MRH_CH03-3009) What is the formula for the expected value of a binomial random variable, with probability of success p and n trials? Onp O np(1-p) O it involves (n choose x), which can be found in Formula 3-15 on p. 104 O there is no formula; you need to calculate it by hand or using Excel QUESTION 16 (MRH_CH03-3010) What is the formula for the variance of a binomial random variable, with probability of success p and n trials? Onp O np(1-p) O it involves (n choose x), which can be found in Formula 3-15 on p. 104 O there is no formula; you need to calculate it by hand or using Excel QUESTION 17 (MRH_CH03_3008) Let X be a binomial random variable with probability of success 0.84. You are going to run 67 trials. What is the expected value of X? Carry your calculations to three decimal places