and Statistics CA
EEE
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In a long series of coffee orders, it is determined that
70% of coffee drinkers use cream, 55% use sugar, and
35% use both.
DA Venn Diagram. One circle is labeled C and the other
is labeled S.
Suppose we randomly select a coffee drinker. Let C be
the event that the person uses cream and S be the
event that the person uses sugar. How would you fill in
the Venn diagram?
in the region where the circles
First, write
overlap.
Then,
to find the probability
that a person uses cream but not sugar, and
to find the probability that a
person uses sugar but not cream.
Subtract all three of these probabilities from 1 to find
the probability that a person uses neither cream nor
sugar, which equals
Done