Grades assigned by an economics instructor have
historically followed a symmetrical distribution: 5% A’s, 25% B’s,
40% C’s , 25% D’s, and 5% F’s. This year, a sample of 150 grades
was drawn and the grades (1 = A, 2 = B, 3 = C, 4 = D, and 5 = F)
were recorded. Can you conclude, at the 10% level of significance,
that this year’s grades are distributed differently from grades in
the past? *****I dont want the excel...