The average score on a standardized test is 500 points with a standard deviation of 50 points. What is the probability that a student scores between 450 and 600 on the standardized test

Question

abb0t · Answer

What is...?

anonymous · Answer

the probability that a student scores between 450 and 600 on the standardized test

anonymous · Answer

1st  standard deviation range - about 68% or (34% if only looking at half)
2nd standard deviation range - about 95% or (47.5% if only looking at half)

anonymous · Answer

picture here might make more sense http://en.wikipedia.org/wiki/Standard_deviation

abb0t · Answer

$Z = \frac{score-mean}{SD}$ 

Calculate Z and find its proportion in table in the back of your stats book labeled "areas under normal distribution". Convert proportion to number of students.