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In a normal distribution, approximately what percentage of the cases, to the nearest whole number, falls within 4 standard deviations of the mean:

Answer:

1. 68%
2. 100%
3. 99%
4. 75%

Answer: B

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In a computer tape library there are two racks with 40 tapes per rack.In a given day 30 tapes are in use . What fraction remains in the rack?Continuing up the number sequence of natural numbers, prime numbers become which of the following: