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A poll of 100 senior citizens in a retirement community asked about the types of electronic communication they used.The table shows the joint and marginal frequencies from the poll results. If you are given that one of the people polled uses text messaging, what is the probability that the person is also using e-mail? Express your answer as a decimal. If necessary, round your answer to the nearest hundredth. 

RainbowPanda  Mar 26, 2018
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24 use text messaging

Of these, 17  also use  e-mail....so....

 

The probability is  17/24 =   70.83   ≈    71%

 

 

cool cool cool

CPhill  Mar 26, 2018

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