Given a population in which the probability of success is p = 0.80, ifa sample of 400 items is taken, then complete parts a and b. a. Calculate the probability the proportion of successes in the sample will be between 0.77 and 0.81. b. Calculate the probability the proportion of successes in the sample will be between 0.77 and 0.81 if the sample size is 200. a. The probability the proportion of successes in the sample will be between 0.77 and 0.81 is |:. (Round to four decimal places as needed.)