Evelyn has 80 pens in a drawer. 15 pens are black and the other pens are blue.
Evelyn picks a pen at random from the drawer.
(a) What is the probability that Evelyn picks a black pen?
(b) What is the probability that Evelyn picks a blue pen?

Translate this phrase into an algebraic expression. 21 more than twice goran's savings use the variable g to represent goran's savings. need to know fast.

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

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