The table below shows the monthly electricity consumption (in units) of 50 households in a locality.
(a) (i) Using the data, calculate the mean, median and mode of the monthly electricity consumption.
(b) (ii) Arrange the three values obtained in (i) in ascending order.
(c) (iii) On the basis of your calculations, state whether the distribution is approximately symmetrical, positively skewed or negatively skewed, giving a brief reason.
(d) Electricity Consumption (units) | Number of Households
0–50 | 4
50–100 | 8
100–150 | 12
150–200 | 15
200–250 | 7
250–300 | 4