Find the Mean (Arithmetic) {3,-6,-15,-24}

Math
The mean of a set of numbers is the sum divided by the number of terms.
Simplify the numerator.
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Subtract from .
Subtract from .
Subtract from .
Reduce the expression by cancelling the common factors.
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Cancel the common factor of and .
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Factor out of .
Cancel the common factors.
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Factor out of .
Cancel the common factor.
Rewrite the expression.
Move the negative in front of the fraction.
Divide.
Find the Mean (Arithmetic) {3,-6,-15,-24}

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