Question

After seeing a number of patients with a food-borne illness, hospital staff tested everyone they could...

After seeing a number of patients with a food-borne illness, hospital staff tested everyone they could find who had eaten at Don's Restaurant on a particular night. They found the following:

Tested Positive Tested Negative Total
Ate ice cream 20 3 23
Did not eat ice cream 10 11 21
Total 30 14 44

How many people were tested altogether?

How many people tested positive who did not eat ice cream?

If a person is chosen at random from among those tested, what is the probability that he both ate ice cream and tested negative? Round your answer to two decimal places.

If a person is chosen at random from among those tested, what is the probability that he did not eat ice cream if it is known that he tested positive? Round your answer to two decimal places.

If a person is chosen at random from among those tested, what is the probability that he ate ice cream or tested positive? Round your answer to two decimal places.

Math   Statistics-And-Probability   
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