Please help with number 20

DPH 623 Practice for Final Page 3 In the population of starting salaries of all May, 2008 graduates at the University of Southern Mississippi, suppose the mean is $38,000 and the standard deviation is $4,000. (0 ) 20. D A random sample of 64 graduates is to be selected from the population. (1 2 1=1-P (2:20 ) what is the probability that the average starting salary in the sample will be above $37,000? (X ) 1-0.5 (A) .4013 (B) .0228 (C) .5987 = D. 5 (D) .9772 21. A P(x> 28,000)= P(X-M > 38, 020- 351000)= P(x-1/ 6> 381000-387000/ 41080 The value of the standard error of the mean is (A) $500 (B) $4000 (C) $38,000 (D) $62.50 After 64 USM graduates have been selected, we find that the average starting salary in the sample is $36,872 and the standard deviation is $3,703. 22. B The symbol for the value $38,000 in this problem is (A) X (B) H (C) HX (D) B