To get to school from her house, Donita walks at a rate of 3 mph north along Troy Ave for 15 minutes. Then she walks at a rate o
f 3.75 mph east along Mesa St for 20 minutes. If she walks directly from her house to school, how fast must she walk to
arrive there in the same amount of time? Fill in the blanks, rounding answers to the nearest tenth.
arrive there in the same amount of time? Fill in the blanks, rounding answers to the nearest tenth.
1 answer:
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Given the dataset
We start by computing the average:
We compute the difference bewteen each element and the average:
We square those differences:
And take the average of those squared differences: we sum them
And we divide by the number of elements:
Finally, we take the square root of this quantity and we have the standard deviation: