The brain volumes ​(cm3​) of 20 brains have a mean of 1138.8 cm3 and a standard deviation of 128.7 cm3. Use the given standard deviation and the range rule of thumb to identify the limits separating...

The brain volumes

of 20 brains have a mean of


and a standard deviation of


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

be significantly​ high?