SOLUTION: In a pizza restaurant, 95% of the customers order pizza. If 65% of the customers order pizza and a salad, find the probability that a customer order a pizza he will not order salad

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Question 549027: In a pizza restaurant, 95% of the customers order pizza. If 65% of the customers order pizza and a salad, find the probability that a customer order a pizza he will not order salad.
Answer by mathie123(224) (Show Source):
You can put this solution on YOUR website!
We know that the Probability of a pizza and salad is 65%.
We also know the probability of a pizza is 95%.
This means that 95%-65%=30% of the customers order just a pizza.
This 30% is 30% of the total people.
Let's look at a quick example. Say we have 100 people.
This means that 95 people have a pizza (with or without a salad) and 30 people have just a pizza (no salad).
This means that the probability of just pizza looking at the total of people who ordered pizza is

Without an example we could have done

Hopefully this helps ((this is just a conditional probability, if you want the more general form, search CONDITIONAL PROBABILITY))
:)