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Ksenya-84 [330]
4 years ago
8

In a cafe, a customer orders one drink. The probability that he orders tea is 0.42. The probability that he orders coffee is 0.3

. Work out the probability that he orders either tea or coffee
Mathematics
1 answer:
babunello [35]4 years ago
4 0
For any given set of probabilities, the total is always 100% or 1.0. (i.e. We know he ordered SOMETHING, so all the choices have to be accounted for.)

P_{total} = 1.0 = P_{tea} + P_{coffee} + P_{neither}
1.0=0.42+0.3+P_{neither}
P_{neither}= 1.0 - 0.72 = 0.28
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