Given cos a = .23 find angle a in radians.

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

Are you guys willing to me with these last 8 questions on my homework for math reply to this question that i posted

Adie is rolled, what is the probability of getting an even number or a 3? write the solution too