In a batch of 1960 calculators, there are, on average, 10 defective ones. If a random sample of 147 is selected, find the probability of having at most 2 defective units. Only the final answer should be rounded-off to FOUR decimal places.

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Q: What is the probability of selecting a sample with the proportion of females being 0.56 or greater?

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Q: Can I use  CRONBACH’S ALPHA in testing the reliability of the device? How?

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