3. Copy and complete the following table which shows weights of 31 objects:
Weight (W)
0 < W <= 10
Frequency(F)
5
6
10 < W <= 20
20 < W <= 40
7
2
40 < W < 50
50 < W <= 55
11
(a) Calculate an estimate of the Mean
(c) Calculate the Range
(b) Write down the modal Group
(d) Calculate which group contains the Median