Suppose the scores on an examination are normally distributed with a mean

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Suppose the scores on an examination are normally distributed with a mean of 50 and a standard deviation of 10.

1) What is the probability that the score of a student will be higher than 60?

2) what proportion of the students score below 30?

3) What is the z score that corresponds to the score 44?

4) What is the raw score that corresponds to z=1.5?