Which of the following not between -10 and -8

-17/2
-7
-9
-8.5

The brain volumes (cm cubed) of 50 brains vary from a low of 904 cm cubed to a high of 1488 cm cubed. use the range rule of thumb to estimate the standard deviation s and compare the result to the exact standard deviation of 175.5 cm cubed, assuming the estimate is accurate if it is within 15 cm cubed

If t17 = 3 (t5) in an arithmetic progression, find t1 in terms of d.

Are the corresponding angles congruent? explain why or why not.