A normally distributed population of scores has a mean of 1000 and a standard deviation of 64. what percentage of scores fall below a score of 872?
In a normal distribution with a mean of 10 and a standard deviation of 2, what actual score corresponds to a z-score of +1.67?
A school only accepts students with the top 20% of sat scores. the sat has a mean of 500 and a standard deviation of 100. what actual score should be used as the cut-off score?