Some students take part in an obstacle race. The time it took each student to complete the race was noted. The results are shown in the histogram.

a Give a reason to justify the use of a histogram to represent these data. The number of students who took between 60 and 70 seconds is 90. b Find the number of students who took between 40 and 60 seconds. c Find the number of students who took 80 seconds or less. d Calculate the total number of students who took part in the race.

AppendixLO1

Transcribed Image Text:

Frequency density 2 16- 14- 12 10- 0+ 40 50 60 70 80 90 100 110 120 Time (seconds)