Answers created by Serpin A.
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You randomly draw a marble from a bag. You don't put it back before drawing a second marble. What kind of event is this?

Could someone please help me prove this identity?
#1/(secA1) + 1/(secA+1) = 2cotAcosecA#

How to find the probability using discrete variables?

How do you rationalize the denominator and simplify #14/ (sqrt7sqrt5)#?

What is the zscore of sample X, if #n = 36, mu= 12.3, St. Dev. =47, and mu_X =18.5#?

For the data set 6, 34, 12, and 14, what is the range?

How do you determine if the following data set is linear or quadratic: (4,10), (3,7), (2,4), (1,1), (0,2)?

How do I determine the x and y intercept for the graph #6(x1)=2(y+3)#?

If you were to add 5 to each value in a data set, what effect would this have on the standard deviation of the data set?

Can the standard deviation ever be negative?