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A process has a standard deviation of 20; values of 187, 182, 164, 190; and a mean of180. Calculate the 95% confidence limits.

142.3 < u < 192.6
144.4 < u < 199.6
158.2 < u < 198.6
150.4 < u < 190.6

Explanation

Answer: B - If a process has a standard deviation of 20; the values of 187, 182, 164, 190; and a mean of180, the 95% confidence limits are 144.4 < u < 199.6. This is calculated by 180 - 1.96 x 10 < u < 180 + 1.96 x 10.

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