Question 654380
In a certain city, 48% of all teenagers own a cellphone and 39% of all teenagers own a cellphone and a PSP. What is the probability that a teenager owns a PSP given that the teenager owns a cellphone?
------------------------
P(owns PSP | owns cellphone) = P(PSP AND cell)/P(cell) = 0.39/0.48 = 0.8125
=======================
Cheers,
Stan H.