The contingency table below shows the results of a survey of online video viewin
ID: 3235924 • Letter: T
Question
The contingency table below shows the results of a survey of online video viewing by age. Find the following probabilities or percentages:
a. Probability that a viewer is aged 18–34.
b. Probability that a viewer prefers watching TV videos.
c. Percentage of viewers who are 18–34 and prefer watching user-created videos.
d. Percentage of viewers aged 18–34 who prefer watching user-created videos.
e. Percentage of viewers who are 35–54 or prefer user created-videos.
Type of Videos Preferred
Viewer Age
User Created
TV
Row Total
18–34
39
30
69
35–54
10
10
20
55+
3
8
11
Column Total
52
48
100
Type of Videos Preferred
Viewer Age
User Created
TV
Row Total
18–34
39
30
69
35–54
10
10
20
55+
3
8
11
Column Total
52
48
100
Explanation / Answer
Ans:
a) Probability that a viewer is aged 18–34=69/100=0.69
b) Probability that a viewer prefers watching TV videos=48/100=0.48
c) Percentage of viewers who are 18–34 and prefer watching user-created videos=39/100=0.39
d)Percentage of viewers aged 18–34 who prefer watching user-created videos=0.39
e)Percentage of viewers who are 35–54 or prefer user created-videos=52/100=0.52
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