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23 November, 22:03

Amy and her partners measured the pH of water samples from different ponds in her neighborhood. This data follows a normal distribution. What is the probability that the pH level of a specific pond was 2 or more standard deviations above the mean?

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  1. 23 November, 22:12
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    From the tables this would be 1 - 0.9773 = 0.0227 or 2.27%
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