A Biology professor is teaching sections A and B of BIOL1000. The professor knows from the past that the student exam marks of section A follows a normal distribution with an average of 65, and a standard deviation of 10 while the student's exam marks of section B follows a normal distribution with an average of 70, and a standard deviation of 20. a) Find the probability that the average exam marks by a random sample of 100 students in section B is less than 67. b) What is the probability that the average exam marks of 81 randomly selected students from section A is one mark higher than the average exam marks of 100 randomly selected students from section B? c) The professor declares that no more than one-quarter of section B's students will get average marks. What is the probability that in a random sample of the 80 section B students, more than 28 will get the average marks?
A Biology professor is teaching sections A and B of BIOL1000. The professor knows from the past that the student exam marks of section A follows a normal distribution with an average of 65, and a standard deviation of 10 while the student's exam marks of section B follows a normal distribution with an average of 70, and a standard deviation of 20. a) Find the probability that the average exam marks by a random sample of 100 students in section B is less than 67. b) What is the probability that the average exam marks of 81 randomly selected students from section A is one mark higher than the average exam marks of 100 randomly selected students from section B? c) The professor declares that no more than one-quarter of section B's students will get average marks. What is the probability that in a random sample of the 80 section B students, more than 28 will get the average marks?
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.5: Comparing Sets Of Data
Problem 13PPS
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