Find the semiinterquartile range for the dataS ={67, 69, 70, 71, 74, 77, 78, 82, 89}
1/2(x_0.75-x_0.25)=1/2(80-69.5)=11.5
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1/2(x_0.75-x_0.25)=1/2(80-69.5)=11.5
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