SOLUTION: The scores on a certain test are normally distributed with a mean score of 69 and a standard deviation of 2. What is the probability that a sample of 90 students will have a mean s
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Question 912339: The scores on a certain test are normally distributed with a mean score of 69 and a standard deviation of 2. What is the probability that a sample of 90 students will have a mean score of at least 69.2108? Answer by ewatrrr(24785) (Show Source):
You can put this solution on YOUR website! normally distributed with a mean score of 69 and a standard deviation of 2
*Note:
z = .2108/(2/sqrt(90)) = 1
P( x > 69.2108)) = 1 - P(z < 1) = 1 - .8413
