How many used none of the above-mentioned means of transportation?

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.6: Summarizing Categorical Data
Problem 13CYU
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A poll was taken of 100 students at a commuter campus to find out how they got to campus. The results were as follows:

27   said they drove alone.
34   rode in a carpool.
35   rode public transportation.
6   used both carpools and public transportation.
6   used both a carpool and sometimes their own cars.
8   used buses as well as their own cars.
5   used all three methods.

How many used none of the above-mentioned means of transportation?

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