SOLUTION: Scores on the SAT test are normally distributed with mean of 500 and standard deviation of 100. Find P(X < 400). Round answer to the nearest whole percent and use the % symbol i

Algebra ->  Percentage-and-ratio-word-problems -> SOLUTION: Scores on the SAT test are normally distributed with mean of 500 and standard deviation of 100. Find P(X < 400). Round answer to the nearest whole percent and use the % symbol i      Log On


   

Question 866817: Scores on the SAT test are normally distributed with mean of 500 and standard deviation of 100.
Find P(X < 400). Round answer to the nearest whole percent and use the % symbol in your answer.
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!


Hi

mean of 500 and standard deviation of 100.

z = (400-500)/100 = -1      

P(x < 400) = 15.87%     normalcdf(-10, -1)  | -10 a placeholder