OpenStax, Introductory Statistics 2e §3.3 Two Basic Rules of Probability · Exercise 1 · Probability · Counting & chance
Two Basic Rules of Probability · Exercise 1
A local restaurant knows that the probability that a customer will order a pizza is 87%. The restaurant also knows that the probability that a customer will order a salad is 32%. Of the customers who order pizzas, 55% of them also order a salad.
In this problem, let:
• Z = event that a customer orders a pizza
• S = event that a customer orders a salad
Suppose that one customer is randomly selected.
Find P(Z).
OpenStax, Introductory Statistics 2e · §3.3 Two Basic Rules of Probability · Exercise 1
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