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Compare Student Solution Strategies
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ParaPro
PPM.165 Compare Student Solution Strategies
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The mean of 8, 10, and x is 12. Two students solve for x. Helena writes (8 + 10 + x)/3 = 12, so x = 18. Carter writes 8 + 10 + x = 12, so x = -6. Which comparison is accurate?
A
Helena's strategy is valid; Carter's strategy is invalid because he forgot that a mean divides the total by the number of values.
B
Helena's strategy is invalid because variables cannot be used in a mean.
C
Both strategies are valid because both use 8, 10, x, and 12.
D
Carter's strategy is valid because the mean is the same as the total, under the stated conditions, under the stated conditions, for the values shown.
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