The mean shoe size of the students in a math class is 7.5. Most of the shoe sizes fall within 1 standard deviation, or between a
2 answers:
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The top row contains the product of 
with each term of the expressions 
and bottom row contains the product of -1 with each term of expression 
.
The final result will be the sum of terms of both rows as shown below:
So the correct answer is option D
The final result will be the sum of terms of both rows as shown below:
So the correct answer is option D