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28 September, 14:48

Heather and her lab partners were trying to find the probability that the weight of a US quarter is below one standard deviation from the mean. They know that the weight of a quarter follows the normal distribution. What was their answer?

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  1. 28 September, 18:23
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    16%

    Step-by-step explanation:

    The Empirical rule says that 68% of a normal distribution lies between - 1 and + 1 standard deviations.

    That means that 32% lies outside of ±1 standard deviations.

    Since the normal curve is symmetrical, that means 16% is less than - 1 standard deviation and 16% is greater than + 1 standard deviation.

    So the answer is 16%.
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