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?

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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