Nilai f

60-64 2

65-69 6

70-74 15

75-79 20

80-84 16

85-89 7

90-94 4

Nilai f Xt fXt x fx x2 fx2

60-64 2 62 124 -3 -6 9 18

65-69 6 67 402 -2 -12 4 24

70-74 15 72 1080 -1 -15 1 15

75-79 20 77 1540 0 0 - -

80-84 16 82 1312 1 16 1 16

85-89 7 87 609 2 14 4 28

90-94 4 92 368 3 12 9 36

70 5435 9 28 137

0.40

Mx 77.64

SD 6.97

1.96 0.128571 0.016531

1.94