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7. A survey of 120 people was conducted to determine how many people watched 3 different television networks. The results were as follows: n(ABC) = 55 n(NBC) = 30 n(CBS)=40 n(ABC and CBS) = 10 n(ABC and NBC) = 12 n(NBC and CBS) = 8 n(NBC and CBS and ABC) = 5 a. How many watched only NBC? b. How many of the 120 people didn't watch any of the three networks?

7. A survey of 120 people was conducted to determine how many people watched 3 different television networks. The results were as follows: n(ABC) = 55 n(NBC) = 30 n(CBS)=40 n(ABC and CBS) = 10 n(ABC and NBC) = 12 n(NBC and CBS) = 8 n(NBC and CBS and ABC) = 5 a. How many watched only NBC? b. How many of the 120 people didn't watch any of the three networks?

Holt Mcdougal Larson Pre-algebra: Student Edition 2012
Holt Mcdougal Larson Pre-algebra: Student Edition 2012
1st Edition
ISBN:9780547587776
Author:HOLT MCDOUGAL
Publisher:HOLT MCDOUGAL
Chapter7: Percents
Section: Chapter Questions
Problem 4CST
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7. A survey of 120 people was conducted to determine how many people watched 3 different television networks. The results were as follows: n(ABC) = 55 n(NBC)= 30 n(CBS) = 40 n(ABC and CBS) = 10 n(ABC and NBC) = 12 n(NBC and CBS) = 8 n(NBC and CBS and ABC) = 5 a. How many watched only NBC? b. How many of the 120 people didn't watch any of the three networks?
Transcribed Image Text:7. A survey of 120 people was conducted to determine how many people watched 3 different television networks. The results were as follows: n(ABC) = 55 n(NBC)= 30 n(CBS) = 40 n(ABC and CBS) = 10 n(ABC and NBC) = 12 n(NBC and CBS) = 8 n(NBC and CBS and ABC) = 5 a. How many watched only NBC? b. How many of the 120 people didn't watch any of the three networks?
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