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Consider the following statements

Control chart for variables provides the

1.   Basic variability of the quality characteristic

2.   Consistency of performance

3.   Number of products  falling outside the tolerance limits            

Which of these statements are correct?

(a) 1,2 and 3                   (b) 1 and 2

(c) 2 and 3                      (d) 1 and 3

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