The grades on the last art exam had a mean of 75%. Assume the population of grades on art exams is known to be distributed normally, with a standard deviation of 7%. Approximately what percent of students earn a score between 75% and 82%?

Question

campbell_st · Answer

do you are looking at the percentage of students between the mean and 1 standard deviation above the mean... 

look at the graph attached and see what percentage is between 0 and 1

campbell_st · Answer

then you can get your answer

ivanzud · Answer

Oh Thanks! I get it now since 75+7=82, there is only 1 deviation. But if I didn't have the graph, how would i know the percentage?