4.2 In a particular used-car yard, 25% of customers each day are female and 30% of...
4.2 In a particular used-car yard, 25% of customers each day are female and 30% of customers have a mobile phone. If being female and having a mobile phone are independent, for an individual customer calculate the probability that:
4.2.1 They are female and have a mobile phone (3)
4.2.2 They are male and have a mobile phone (3)
4.2.3 They are female or have a mobile phone (3)
Homework Answers
4.2.1 P(Female and have a mobile phone) = P(Female) * P(Have a mobile phone) = 0.25 * 0.30 = 0.075
4.2.2 P(Male and Have a mobile phone) = P(Male) * P(Have a mobile phone) = (1 - 0.25) * 0.30 = 0.225
4.2.3 P(Female or Mobile phone) = P(Female) + P(Mobile phone) - P(Both) = 0.25 + 0.30 - 0.075 = 0.475
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