The brain volumes ​(cm^3​) of 20 brains have a mean of 1128.8 cm^3 and a standard deviation of 129.3 cm^3. 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 1427.4 cm^3 be significantly​ high? Significantly low values are ____ cm^3 or lower.

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The brain volumes ​(cm^3​) of 20 brains have a mean of 1128.8 cm^3 and a standard deviation of 129.3 cm^3. 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 1427.4 cm^3 be significantly​ high?

Significantly low values are ____ cm^3 or lower.

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