8. Suppose that 20% of the articles produced by a machine are defective, the defectives occurring at random during production. Using the normal distribution for determining approximations, a. What is...

Extracted text: 8. Suppose that 20% of the articles produced by a machine are defective, the defectives occurring at random during production. Using the normal distribution for determining approximations, a. What is the approximate probability that if a sample of 400 items is taken from the production, more than 100 will be defective? b. For what value of Kis the probability 0.95 that the number of defectives in the sample will fall within 80 ± K? Fo