At a smoking cessation center, three groups of smokers are interviewed. Each gro

Question

At a smoking cessation center, three groups of smokers are interviewed. Each group has 6 people. The numbers of cigarettes smoked per day by the members of each group are given below: Group 1:2, 4, 6, 8, 10, 12 Group 2: 6, 6,7,7,8, 8 Group 3: 1, 1, 3, 11, 13, 13 In addition, the histogram of the number of cigarettes smoked per day for each group is presented below. The mean number of cigarettes smoked is 7 per day for every group. Reviewing these histograms, and the data above carefully, which group appears to have the greatest variability in terms of number of cigarettes smoked? Number of Cigarettes Smoked Per Day

Explanation / Answer

The fist group is(X)=2,4,6,8,10,12

X^2=4,16,36,64,100,144

The variance of first group is 14

var=14

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