The brain volumes ​(cm3​) of 20 brains have a mean of 1197.8cm3 and a standard deviation of 124.5cm3. Use the given standard deviation and the range rule of thumb to identify the limits separating...

The brain volumes ​(cm3​) of 20 brains have a mean of 1197.8cm3 and a standard deviation of 124.5cm3. 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 1416.8cm3 be significantly​ high? Significantly low values are __________________cm3 or lower. ​(Type an integer or a decimal. Do not​ round.)