Q. Vani did a survey of the numbers of brothers and sisters for each of the children in her class with the following results:
0, 1, 5, 3, 6, 4, 0, 0, 1, 2, 3, 1, 0, 1, 5, 4, 2, 1, 3, 3, 2, 1, 0, 1
(a) Make a tally of Vani's results.
How many children have no brothers or sisters?
[3]
(b) The pictograph shows the number of books read by 4 pupils last year.
How many more books were read by Varun than Hemant?
[2]