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NatalieD
NatalieD NatalieD
  • 27-04-2016
  • Mathematics
Answered

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

Verified Answer :

twvogels
twvogels twvogels
  • 27-04-2016

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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