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.

357	339	342	341	348	332	336	341	346	346
345	337	358	360	361	342	343	343	336	340
352	352	346	345	348	341	340	344	353	350
359	343	345	333	348	342	339	352	351	347
344	341	340	347	336	339	360	345	353	359
338	349	350	342	348	361	355	353	347	339

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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