Standard Normal Distribution

1. In a Math test, the mean score is 45 and the standard deviation is 4. Assuming normality, what is the probability that a score picked at random will lie below score 38?

 

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2. In a Math test, the mean score is 45 and the standard deviation is 4. Assuming normality, what is the probability that a score picked at random will lie above score 50?

3. In a Math test, the mean score is 45 and the standard deviation is 4. Assuming normality, what is the probability that a score picked at random will lie between 39 and 52?

4. Solve P ( z > -2.20 ) =

5. Solve P ( 0 < z < 1.25 ) =

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