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Question: which group has the smaller standard deviation select one a...

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Which group has the smaller standard deviation?

Select one:

a. Group A: 1,2,3,10,20,25,30,40.

b. Group B: 1,5,10,15,20,25,30.

c. Group C: 20,21,22,23,24,25,26.

d. Group D: 20,40,50,60,80,100,110.

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