he formula for Coefficient of variation is: standard deviation divided by mean (times 100% - which will change the decimal to a percent)
Problem page 143 problem #24
Step 1 find the mean of the data set
Step 2 find the standard deviation of the data set
Step 3 divide the standard deviation by the mean
Step 4 turn the decimal answer from step 3 into a percent by mulitplying by 100% or moving the decimal two places to the right
Step 5 the smaller percent has the least variability in the data
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