SOLUTION: A distribution of values is normal with a mean of 49.7 and a standard deviation of 25. Find P70, which is the score separating the bottom 70% from the top 30%. P70 = ________

Algebra ->  Probability-and-statistics -> SOLUTION: A distribution of values is normal with a mean of 49.7 and a standard deviation of 25. Find P70, which is the score separating the bottom 70% from the top 30%. P70 = ________      Log On


   



Question 1181471: A distribution of values is normal with a mean of 49.7 and a standard deviation of 25.
Find P70, which is the score separating the bottom 70% from the top 30%.
P70 = _________

Enter your answer as a number accurate to 4 decimal places.

Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
P%28X+%3C=+P%5B70%5D%29+=+P%28Z+%3C=+%28P%5B70%5D-49.7%29%2F25%29+=+0.70 ===> 0.524+=+%28P%5B70%5D-49.7%29%2F25 ===> P%5B70%5D+=+0.524%2A25+%2B+49.7+=+62.8

the z-score was obtained from https://stattrek.com/online-calculator/normal.aspx.