Question

A questionnaire sampled 152 Red River College students and asked them how many text messages they sent each day. The answers ranged from 30 to 190. You are preparing to display the data in a frequency distribution. Calculate the class width. Round to the nearest whole number. (1 mark) A/

Answer 1

Let X be random variable of no of message sent by each student.

n=sample size

n=152

min(x)=30

max(x)=190

range=190-30

range=160

Let class width be 20 because 160/20=8 classes as follows we can make

30-50

50-70

70-90

90-110

110-130

130-150

150-170

170-190

if we consider class width 10 then classe we increases to 160/10=16 which is very high number

so class width should be 20