The accompanying table shows the scores on a classroom test. What is the population standard deviation
x: 100, 95, 90, 80, 75, 72, 70
f: 7, 2, 10, 4, 2, 3, 4

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ooh statistics.....dont remember this but tiere's a formula for Standard Deviation...google it lol

\[\sum_{n=1}^{3}i^(n-1)\]

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