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/(secA-1) + 1/(secA+1) = 2cotAcosecA#
  
• How to find the probability using discrete variables?
  
• How do you rationalize the denominator and simplify #14/ (sqrt7-sqrt5)#?
  
• What is the z-score 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(x-1)=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?