Use the Empirical Rule to Solve the Problem

question 41

Multiple Choice

Use the empirical rule to solve the problem.
-The amount of Jen's monthly phone bill is normally distributed with a mean of $78 and a standard deviation of $9. What percentage of her phone bills are between $51 and $105?

• A)68%
• B)95%
• C)99.7%
• D)99.99%

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Definitions:

Independent Events

Two or more events where the occurrence of one does not affect the probability of the other(s).

Event Will Not Occur

The probability that a specific event does not happen, which can be calculated by subtracting the event’s probability of occurring from 1.

Conditional Probability

The likelihood of one event happening after another event has already taken place.

Independent Events

Events whose occurrence or outcome is not influenced by one another; the outcome of one event does not affect the outcome of another.