Question

On a standardized test, scores are normally distributed with a mean of 400 and a standard deviation of 80. What score must one have to be in the 80th percentile?

Answer 1

Answer:

Step-by-step explanation:

From 60 to 75 is 3 standard deviations - so 49.85% of the class

From 75–80 is 1 standard deviation so 34% of the class

So total is 34+50 - about 84%