(a) What is the class width?
The width of the class is 5.
(b) How many teachers are having the maximum teaching experience and how many have the least teaching experience?
Teachers having maximum teaching experience is 2 and Teachers having least teaching experience is 5.
(c) How many teachers have teaching experience of 10 to 20 years?
Teachers have teaching experience of 10 to 20 years is 7 + 2 = 9.
