1) in a normal distribution, what is the proportion of are between the z scores -2.09 and +.53?
2) in a normal distributio, find the probability expressed as a percentage that is greater than a z score of 2.33

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

15 there is a line that includes the point 0,10 and has a slope of 7/4. what is it’s equation in slope intercept form

The price of one share of a company’s stock declined $13.89 every day for 2.5 days what was the stocks total decline in price