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( a) (i) Boundary Frequency Mid-point x fx 20.45 - 20.95 3 20.95 - 21.45 10 21.45 - 21.95 11 21.95 - 22.45 13 22.45

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( a) (i) Boundary Frequency Mid-point x fx 20.45 - 20.95 3 20.95 - 21.45 10 21.45 - 21.95 11 21.95 - 22.45 13 22.45 - 22.95 9 22.95 - 23.45 2 Ef =48 Efx f x2 (1mark-Mid-point, 1mark- fx, 1mark- fx , 1mark->fx, 1mark- >fx ) (5 marks) (ii ) mean = b (2 marks) (ii ) variance, 62 variance, 62 (2 marks) variance, 62 = (1 mark)

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