The brain volumes ​(cm3​) of 20 brains have a mean of 1143.3 cm3 and a standard deviation of 129.9 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 1363.1 cm3 be significantly​ high? Significantly low values are ____ cm3 or lower. Significantly high values are ____ cm3 or higher.

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