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Calculate the variance of the number of flaws

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Reference no: EM132858139

The surface finish is evaluated on 40 samples of magnetic tape with the results given in the table below. Based on this information, calculate the variance of the number of flaws per sample of tape.

Number of flaws 0 1 2 3 4 5

Number of samples 18 12 7 2 1 0

Reference no: EM132858139

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