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Textbook question. Need help in understanding how this is done. Not using for work other then to further understand the subject. Question 6.10 The final

Textbook question. Need help in understanding how this is done. Not using for work other then to further understand the subject.

Question 6.10

The final grade is normally distributed with a mean of 73 and a standard deviation of 8.

1. What is the probability of getting a grade of 91 or less?

2. That a student obtains a grade between 65 and 89?

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