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(Solved): Calculate the variance and standard deviation for samples with the following statistics. a. n=9,\sum ...



Calculate the variance and standard deviation for samples with the following statistics. a.

n=9,\sum x^(2)=84,\sum x=18

b.

n=41,\sum x^(2)=384,\sum x=90

c.

n=20,\sum x^(2)=16,\sum x=15

a. The variance is

The standard deviation is

(Round to the nearest thousandth as needed.)



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