(a) A set of data shows the weight of 48 machines. (i) Boundary Frequency 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 (ii) Find the mean of the data. (iii) Find the variance of the data using formula. (iv) Using a scale of 2 cm to 5 frequency on the vertical axis and 2 cm to 5 boxes on the horizontal axis, draw a histogram of the distribution