For a certain standardized placement test, it was found that the scores were normally distributed, with a mean of 160 and a standard deviation of 20. Suppose that this test is given to 1000 students. (Recall that 34% of z-scores lie between 0 and 1, 13.5% lie between 1 and 2, and 2.5% are greater than 2.) (a) How many are expected to make scores between 140 and 180? students (b) How many are expected to score above 200? students (c) What is the expected range of all the scores?
For a certain standardized placement test, it was found that the scores were normally distributed, with a mean of 160 and a standard deviation of 20. Suppose that this test is given to 1000 students. (Recall that 34% of z-scores lie between 0 and 1, 13.5% lie between 1 and 2, and 2.5% are greater than 2.) (a) How many are expected to make scores between 140 and 180? students (b) How many are expected to score above 200? students (c) What is the expected range of all the scores?
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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Question
For a certain standardized placement test, it was found that the scores were
(a) How many are expected to make scores between 140 and 180?
students
(b) How many are expected to score above 200?
students
(c) What is the expected range of all the scores?
students
(b) How many are expected to score above 200?
students
(c) What is the expected range of all the scores?
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