2. Question: The lifespan of wafer processing machines used by a semiconductor manufacturing company are given below: Machine no. Lifespan (months) 1 120 2 150 3 110 4 100 5 125 6 130 7 120 8 110 9 115 10 120 ii. Find the standard deviation of the sample. iii. Find the confidence interval of mean for the lifespan of wafer processing machines at 99% confidence level.

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