SOLUTION: A large group of students took a test in physics and the final grade have a mean of 70 and a standard deviation of 10 if we can approximate of these grades by a normal distribution

Question 1191452: A large group of students took a test in physics and the final grade have a mean of 70 and a standard deviation of 10 if we can approximate of these grades by a normal distribution, what percent of the students.
a. Scored higher than 80?
b. Should pass the test(grades≥60)?
c. Should fail the test (grades≤60)?
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
z=(x-mean)/sd
a. Score >1 sd which is about 16%
b.Score >-1 sd, which its about 84%
c. The complement of b, which is about 16%
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