SOLUTION: Scores on a standardized test are normally distributed with a mean of 450 and a standard deviation of 35. Approximately what percent of students scored between 460 and 480?

Question 898687: Scores on a standardized test are normally distributed with a mean of 450 and a standard deviation of 35. Approximately what percent of students scored between 460 and 480?
Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!

 

Hi

z = (460-450)/35 = 10/35 = .2857,  P(z < .2857) = .6124  0r 61.24%

z = (480-450)/35 = 30/35 = .8571   P(z < .8571) = .8040  0r 80.40%

between... 80.40% - 61.24%  = 19.16% 

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