The marks on a statistics midterm test are normally distributed with a mean of 78 and a standard…

The marks on a statistics midterm test are normally distributed with a mean of 78 and a standard devia- tion of 6.

a. What proportion of the class has a midterm mark of less than 75?

b. What is the probability that a class of 50 has an average midterm mark that is less than 75?

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