In a survey done by the local Better Buy store, questions were asked of 300 households that actually purchased big-screen televisions. The table at left indicates the consumer's responses to whether the television purchased was a plasma screen and whether they also purchased a DVR in the past 12 months.

a. What is the probability that a randomly selected big-screen television purchase in this sample is a purchase of a plasma-screen television?

b. What is the probability that a randomly selected household that purchased a big screen television purchased a plasma-screen AND a DVR?

c. What is the probability that a randomly selected household purchased a DVR, given that the household purchased a plasma-screen television?

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Purchased DVR No Purchased Plasma Screen Plasma Screen Total Yes 38 42 80 Not Plasma Screen 70 150 220 Total 192 108 300