Question

The following data were collected in a survey of 10th graders and summarize their cell phone status. No cell phone Conventional cell phone user Smart phone user Boys 55 65 35 Girls 31 78 26

a) What proportion of the 10th graders have cell phones?
b) What proportion of the boys do not have cell phones?
c) What proportion of smart phone users are boys?

Answer 1

Consider the following calculation

Explanation:

The following data were collected in a survey of 10th graders and summarize their cell phone status.

No Cell Phone Conventional cell phone user Smart phone user

Boys 55 65 35

Girls 31 78 26

A)

Proportion of the 10th graders have cell phones=(65+78+35+26)/Total=204/290=0.703

B)

Proportion of the boys do not have cell phones=55/(no.of boys)=55/(55+65+35)=55/155=0.35

C)

Proportion of smart phone users are boys=(65+35)/(65+35+78+26)=100/204=0.490