Without actually calculating the variability study the, Ask an Expert

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Without actually calculating the variability, study the following sample distributions:
Distribution a: 21, 24, 28, 22, 20
Distribution b: 21, 32, 38, 15, 11
Distribution c: 22, 22, 22, 22, 22

a. Rank-order them according to your best guess of their relative variability.

b. Calculate the standard deviation of each to verify your rank ordering.

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