This math skill teaches how to find a number to add to a set of numbers in order to achieve a specific change in the mean. The process involves calculating the original mean, determining the desired mean, and then using these values to find the necessary number to add.
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Find the change in the mean when a number is added
Test your understanding of change in the mean when a number is added by practicing it! Work through the below exercises to use it in practice.
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What number can we add to decrease the mean by 1?
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Let's find our original mean. 9 plus 5 is 14, and 14 divided by 2 is 7, so our original mean is 7
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It decreases by 1, so it will become 6
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So we have 3 numbers with a mean of 6. That means they must add to 3 times 6, or 18
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Our starting numbers add to 14, so our new number must be 4