SOLUTION: Test scores in a college course have a mean of 68.7 and a standard deviation of 20.6. What percentage of 25 students chosen at random passed the test?

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Question 509110: Test scores in a college course have a mean of 68.7 and a standard deviation of 20.6. What percentage of 25 students chosen at random passed the test?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
Test scores in a college course have a mean of 68.7 and a standard deviation of 20.6. What percentage of 25 students chosen at random passed the test?
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Assuming that 70 or greater is quired to pass,
z(70) = (70-68.7)/20.6 = 0.0631
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P(x >= 70) = P(z > 0.0631) = 0.4748 = 47.48% passed
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Cheers,
Stan H.