A quality-conscious disk manufacturer wishes to know the fraction of disks his company makes which are defective. Suppose a sample of 609 floppy disks is drawn. Of these disks, 536 were not defective. Using the data, estimate the proportion of disks which are defective. Enter your answer as a fraction or a decimal number rounded to three decimal places.
b. Using the data, construct the 90% confidence interval for the population proportion of disks which are defective. Round your answers to three decimal places.

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