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Use the probability distribution to complete parts​ (a) and​ (b) below. The number of defects per 1000 machine parts inspected Defects 0 1 2 3 4 5 Probability 0.2690.269 0.3020.302 0.2420.242 0.1370.137 0.0400.040 0.0100.010 Question content area bottom Part 1 ​(a) Find the​ mean, variance, and standard deviation of the probability distribution.