A cell phone company found that 75% of all customers want text messaging on their phones, 80% want photo capability, and 65% want both. What is the probability that a customer who wants text messaging also wants photo capability?
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Answer. Let's say that 75% of smartphone customers want text messaging; 80% want photo capability; 65% want both. What is the probability that a customer wants photo capability, given that he wants text messaging? 65/75=13/15 or about 86.7%.
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