If one score is randomly selected from a normal distribution with = 100 and = 20, the probability ...

If one score is randomly selected from a normal distribution with  = 100 and  = 20, the probability of obtaining a score less than X = 130 is p = 0.9987.
 
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Question 2

If one score is randomly selected from a normal distribution with  = 100 and  = 20, the probability of obtaining a score less than X = 95 is p = 0.4013.
 
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Question 3

For a normal distribution with  = 80 and  = 10, the score that separates the bottom 10 of the distribution from the rest is 67.2
 
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Question 4

For a normal distribution with  = 50 and  = 10, the line separating the highest 10 of the scores from the rest is located at X = 51.28.
 
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