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A quality control unit in ball-bearing manufacturing company remains record of error in terms of number of faulty balls (W) per a lot. The size of standard lot is 8, and the probability distribution of the single lot holding faulty balls is known as follows: W 1 2 3 4 5 6 7 8 Probability (W=w) 0.6 0.2 0.07 0.06 0.03 0.02 0.01 0.01

a. Make a table for cumulative probability distribution of W.

b. Find out the expected number of faulty balls per lot, i.e. E[W], and the variance, V[W].

c. Make a table for probability distribution of W2 . d. Based off of b) and c), demonstrate that V [W]=E[W2 ]-E[W] 2 e. Find P (W?5).

Operation Management, Management Studies

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