According to normal distribution,
Mean = 55
55-40 = 70-55 = 15 = SD
and 97.5 is 2SD from mean.
So , 85 is 97.5th percentile.
On a national standardized test, with normally distributed results, the middle 68% of students scored between 40 points and 70 points, and the mean score was 55 points.
Based on this information, which of the following represents a score in the 97.5th percentile?
2 answers
score is 2
1 answer