Concept explainers
To find: the
Answer to Problem 10CRE
The required mean and standard deviation are 250 and 175.78 respectively.
Explanation of Solution
Calculation:
LetXbe the scores obtained by students.
That is,
The z -values corresponding to 0.10 and 0.90 are -1.28 and 1.28 respectively.
The following graph illustrates the given information to set up two equations in two unknowns.
Then, we can find the values of unknown mean and standard deviation using the following two equations as follows:
Solving the above two equations, we get
And
Conclusion:
Hence, the required mean and standard deviation are 250 and 175.78 respectively.
Chapter 2 Solutions
The Practice of Statistics for AP - 4th Edition
Additional Math Textbook Solutions
Elementary Statistics: Picturing the World (7th Edition)
Statistics for Business and Economics (13th Edition)
Elementary Statistics Using Excel (6th Edition)
Statistics: The Art and Science of Learning from Data (4th Edition)
Introductory Statistics
Basic Business Statistics, Student Value Edition
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