The weights of 60 flour bags in a warehouse have been grouped as below:
Weight (kg): 40–50, 50–60, 60–70, 70–80, 80–90, 90–100
Number of bags: 5, 9, 15, 16, 10, 5
Using the information given, answer the following:
(i) Construct a more–than cumulative frequency table for the data.
(ii) On graph paper, draw the more–than cumulative frequency curve.
(iii) With the help of the curve, estimate:
(a) the median weight of the bags,
(b) the number of bags that weigh at least 75 kg.