The brain volumes (cm3) of 20 brains have a mean of 1094.9 cm3 and a standard deviation of 128.9 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 1392.7 cm3 be significantly high?

Yes, a brain volume of is significantly high.

Step-by-step explanation:

Given

The range rule of thumb indicates that the usual values are within 2 standard deviations from the mean:

minimum usual value = mean - 2 * standard deviation =

maximum usual value = mean + 2 * standard deviation =

We can see that is not between and , which indicates that this value is unusually high.

5/6

step-by-step explanation:

if i remember correctly with perpendicular stuff you just take away the negative

it is contrapositive

i could not see the question too well so check yourself again too . this is because i want you to get it correct.