SOLUTION: Possible Points: 2
The points obtained by students on a test in a class are normally distributed with a mean of 60 points and a standard deviation of 5 points. About what percent
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The points obtained by students on a test in a class are normally distributed with a mean of 60 points and a standard deviation of 5 points. About what percent
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Question 1164245: Possible Points: 2
The points obtained by students on a test in a class are normally distributed with a mean of 60 points and a standard deviation of 5 points. About what percent of students have scored less than 70 points?
You can put this solution on YOUR website! About means use empirical rule
This is probability something is fewer than 2 sd s above the mean (z<(70-60)/5)
This is 0.9772 exactly
with the empirical rule 95% are between +/- 2 sd s, so there is 0.0250 on either side, so the part that isn't possible is the part below +2 sd, and that has probability 0.9750.
The answer will then be the complement or 0.9750 probability.
