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Find the probability that the number of defective boards

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Reference no: EM132138137

When circuit boards used in the manufacture of compact disc players are tested, the long  run percentage of defectives is 5%. Let X= the number of defective boards in random sample of size n=25, so X ~ Bin( 25, .05).

a) Find the probability that the number of defective boards is (i) At most 2 (ii) At least 5 (iii) Between 1 and 4, inclusive. 

b) What is the probability that none of the 25 boards is defective? c) Calculate the expected value and standard deviation of X.

Reference no: EM132138137

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