SOLUTION: A Large group of students took a test in Math and the final grades have a mean of 75 and a standard deviation of 8. If we can approximate the distribution of these grades by a norm
Algebra.Com
Question 1006219: A Large group of students took a test in Math and the final grades have a mean of 75 and a standard deviation of 8. If we can approximate the distribution of these grades by a normal distribution. What percentage of the students
(a) should pass the test (grades >= 60)
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
z=(x-mean)/sd
(60-75)/8
= -1.875
Want the probability z>= -1.875
It is 0.9696
RELATED QUESTIONS
A large group of students took a test in physics and the final grade have a mean of 70... (answered by Boreal)
A group of more than 1000 students took a test in Mathematics and their final grades have (answered by rothauserc)
A large group of students took a test in Physics and the final grades have a mean of 80... (answered by Theo)
A teacher finds that the test scores of a group of 40 students have a mean of 75 and a... (answered by solver91311)
Students at Arrowhead High School took a Math test with a mean of 120 and a standard... (answered by Theo)
Dwayne and Lloyd began arguing about who did better on their tests, but they couldn't... (answered by math_tutor2020)
The mean and standard deviation of 500 students who took a statistics final were 72 and... (answered by robertb)
The mean and standard deviation of 500 students who took a statistics final were 72 and... (answered by Boreal)
The mean and standard deviation of 500 students who took a statistics final were 72 and... (answered by stanbon)