One standard deviation of the mean value

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Reference no: EM1314486

Specimens of aluminium alloy rods are tested to determine their tensile strength. The results, in MPa, are given below.

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i. Draw a frequency polygon and a cumulative frequency polygon for the data. Use the cumulative frequency polygon to estimate the median strength and the inter-quartile range of the data.

ii. Determine the mean and standard deviation of the data. What percentage of the data lies within one standard deviation of the mean value?

Reference no: EM1314486

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