Exam grades: Scores on a statistics final in a large class were normally distributed with a mean of 78 and a standard deviation of 8. Use the TI-84 PLUS calculator to answer the following Round the...

Extracted text: Exam grades: Scores on a statistics final in a large class were normally distributed with a mean of 78 and a standard deviation of 8. Use the TI-84 PLUS calculator to answer the following Round the answers to at least four decimal places (a) What proportion of the scores were labove 927 (b) What proportion of the Scores were below 64? (c) What is the probability that a randomly chosen score is between 70 and 85?