The weights of 45 children are given below: 41, 31, 48, 34, 75, 39, 45, 41, 55, 52, 40, 57, 43, 61, 47, 64, 56, 47, 41, 59, 46, 67, 45, 64, 48, 52, 58, 53, 64, 59, 43, 50, 62, 54, 68, 59, 69, 57, 57, 53, 52, 56, 61, 55, 69.
Make a histogram and find the number of children whose weights are in the range of 50 - 70?