SOLUTION: a customer enters a supermarket. the probability that they will buy bread is 0.6, the probability that they will buy milk is 0.5, and the probability that they will buy both is 0.3

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Question 336208: a customer enters a supermarket. the probability that they will buy bread is 0.6, the probability that they will buy milk is 0.5, and the probability that they will buy both is 0.3. What is the probability that they will buy either bread or milk or both?
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
P(One or other or both) = P(Buys Bread) + P(Buys Milk) - P(Buys Both)


P(One or other or both) = 0.6 + 0.5 - 0.3


P(One or other or both) = 1.1 - 0.3


P(One or other or both) = 0.8


So the probability of buying one or the other, or both, is 0.8 (which is an 80% chance)