The following contingency table gives the results of a sample survey of South African male and female respondents with regard to their preferred brand of notebook: Preferred Brand HP Lenovo Dell Total No. of Females 110 60 70 240 No. of Males 40 50 70 160 Total 150 110 140 400 Q.1.1.1 What is the probability of randomly selecting a male respondent from the sample? Q.1.1.2 What is the probability of randomly selecting a respondent who is female and prefers HP? Q.1.1.3 What is the probability of selecting a male respondent, given that the preferred brand is Lenovo? Q.1.1.4 What is the probability of selecting a respondent who is male or who prefers HP? Q.1.1.5 What is the probability of selecting a respondent who does not prefer Lenovo?
The following
|
|
Preferred Brand |
|
||
|
|
HP |
Lenovo |
Dell |
Total |
|
No. of Females |
110 |
60 |
70 |
240 |
|
No. of Males |
40 |
50 |
70 |
160 |
|
Total |
150 |
110 |
140 |
400 |
Q.1.1.1 What is the
Q.1.1.2 What is the probability of randomly selecting a respondent who is female and prefers HP?
Q.1.1.3 What is the probability of selecting a male respondent, given that the preferred brand is Lenovo?
Q.1.1.4 What is the probability of selecting a respondent who is male or who prefers HP?
Q.1.1.5 What is the probability of selecting a respondent who does not prefer Lenovo?
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