Question:
Look at the histogram below and answer the questions that follow.
(a) How many students have height more than or equal to 135 cm, but less than 150 cm ?
(b) Which class interval has the least number of students?
(c) What is class size?
(d) How many students have height less than 140 cm?
Solution:
(a) Number of students who have height more than or equal to 135 cm, but less than 150 cm = 14+ 18+ 10 = 42
(b) The class interval 150-155 has the least number of students, i.e. 4.
(c) We-know, class size = Upper class limit – Lower class limit Consider any class, say (125-130), then class size = 130-125 = 5 Hence, the class
size is 5.
(d) Number of students who have height less than 140 cm = 6 + 8 + 14 = 28