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A particular process has two independent sources of variation. The standard deviation of the first source is 3 units and the standard deviation of the second source is 4 units. The standard deviation of the processes is:
Correct Answer: C
You have to take the Variance to calculate the SD. Variance = (S.D) * (S.D) S.D = Sqrt of Variance Variance of the first source = 3 * 3 = 9 Variance of the second source = 4 * 4 = 16 Total Variance = 25 S.D = Sqrt of variance = 5