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(2) (3) (4) Xj f j Cum f up Cum f down 76 1 1 75 0 1 74 2 3 73 3 6 72 6 69 12 71 7 63 19 70 9 56 69 10 47 68 8 37 67 8 29 66 7 21 65 5 14 64 5 9 63 3 4 62 1 1 n = 75 75/4 = 18.75 (75)(3/4) = 56.25
___________________________________________ (2) (3) Xj f j f j xj 76 1 76 75 0 0 74 2 148 73 3 219 72 6 432 71 7 479 70 9 630 69 10 690 68 8 544 67 8 536 66 7 462 65 5 325 64 5 320 63 3 189 62 1 62
(2) (3) (4) Xj f j Xj - X fj(Xj - X)^2 76 1 7.6 57.76 75 0 6.6 0 74 2 5.6 62.72 73 3 4.6 63.48 72 6 3.6 77.76 71 7 2.6 47.32 70 9 1.6 23.04 69 10 0.6 3.60 68 8 -0.4 1.28 67 8 -1.4 15.68 66 7 -2.4 40.32 65 5 -3.4 57.80 64 5 -4.4 96.80 63 3 -5.4 87.48 62 1 -6.4 40.96 n=75 676.00