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The brain volumes (cm3) of 20 brains have a mean of 1074.2 cm3 and a standard deviation of 129.2 cm3. Use the given standard deviation

The brain volumes (cm3) of 20 brains have a mean of 1074.2 cm3 and a standard deviation of 129.2 cm3. Use the given standard deviation and the range rule of thumb to identify the limits separating values that are significantly low or significantly high. For such data, would a brain volume of 1362.6 cm3 be significantly high?

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