Stacy took test whose mean was 70 and standard deviation was 5. The total points possible was 100. What was Stacey's actual exam score?

You must be leaving something out.
You don't have anything here that would tell you what Stacy score was.



Using the empirical rule, you know about 68 percent is between mean +/- 1 standard deviation
95 percent is between the mean +/- 2 standard deviations
99.7 is between the mean +/- 3 standard deviations
This tells you that there is about a 68 percent chance , her score is between 65-75
This tells you that there is about 95 percent chance , her score is between 60-80

So 95 Percent of the score include all of your answers.
This tells you that there is about 99.7 percent chance, her score is between 55 - 85
so her score could any of these values.

So 95 Percent (60-80) of the scores include all of your answers....Show more