Suppose a simple random sample of size nequals36 is obtained from a population with mu equals 87 and sigma equals 12. (a) describe the sampling distribution of x overbar. (b) what is upper p left parenthesis x overbar greater than 89.3 right parenthesis? (c) what is upper p left parenthesis x overbar less than or equals 83 right parenthesis? (d) what is upper p left parenthesis 85.7 less than x overbar less than 91.7 right parenthesis? (a) choose the correct description of the shape of the sampling distribution of x overbar. a. the distribution is skewed left. b. the distribution is skewed right. c. the distribution is approximately normal. d. the distribution is uniform. e. the shape of the distribution is unknown.