(a) What is the probability that a randomly selected student achieves a final score of 90 or above? (b) What is the probability that a randomly selected student achieves a final score of 70 or below? (c) Suppose there are 120 students in class. Based on your answer in part a, what is the expected number of students who achieves a final score of 90 and above? Justify your answer,'

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
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ISBN:9780079039897
Author:Carter
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Chapter10: Statistics
Section10.4: Distributions Of Data
Problem 19PFA
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5. The final scores of students in a course approximately follow a normal distribution with a mean of 76
points and a standard deviation of 6.5 points.
(a) What is the probability that a randomly selected student achieves a final score of 90 or above?
(b) What is the probability that a randomly selected student achieves a final score of 70 or below?
(c) Suppose there are 120 students in class. Based on your answer in part a, what is the expected
number of students who achieves a final score of 90 and above? Justify your answer,
Transcribed Image Text:5. The final scores of students in a course approximately follow a normal distribution with a mean of 76 points and a standard deviation of 6.5 points. (a) What is the probability that a randomly selected student achieves a final score of 90 or above? (b) What is the probability that a randomly selected student achieves a final score of 70 or below? (c) Suppose there are 120 students in class. Based on your answer in part a, what is the expected number of students who achieves a final score of 90 and above? Justify your answer,
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