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Probability

Can anybody help me with this two examples problems. Some of them are giving me a lot of numbers which it should give me a few numbers comparing them to the other results I was manage to do.
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2. Social Security Numbers Each social security number is a sequence of nine digits. What is the probability of randomly generating nine digits and getting your social security number?

Positive Test Results Negative Test Result
Subject is pregnant 80 5
Subject is not pregnant 3 11

1. Assume that one of the subjects is randomly selected. Find the probability that the selected subject is not pregnant, given that the test was negative. Is the result the same as the probability of a negative test result given that the selected subject is not pregnant?

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2. Social Security Numbers Each social security number is a sequence of nine digits. What is the probability of randomly generating nine digits and getting your social security number?

The chances of drawing a single number matching a single your social security number is 1/10 because there are 10 digits you can draw from (0, 1, 2, 3, 4, 5, 6, ...

Solution Summary

This solution provides an explanation of two different probability problems.

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