Suppose that, for a certain exam, a teacher grades on a curve. 2.2% 2.2% 34.1% 34.1% 0.1% 0.1% 13.6% 13.6% μ-3σ μ-2σμ-Ισ u+lo µ+2o µ+3o It is known that the mean is 70 and the standard deviation is 5. There are 25 students in the class. If an exam paper is selected at random, what is the probability that it will be a failing paper? (Round your answer to three decimal places.) |-9 Frequency

A First Course in Probability (10th Edition)
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ISBN:9780134753119
Author:Sheldon Ross
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Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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can someone please give me exact solution, i don't understand. specially when using my TI-84 Calculator.

Suppose that, for a certain exam, a teacher grades on a curve.
2.2%
2.2%
34.1% 34.1%
0.1%
0.1%
13.6%
13.6%
u-30 µ-20 µ-lo
µ+lo µ+2o µt+3o
It is known that the mean is 70 and the standard deviation is 5. There are 25 students in the class.
If an exam paper is selected at random, what is the probability that it will be a failing paper? (Round your answer to three decimal places.)
-9
Transcribed Image Text:Suppose that, for a certain exam, a teacher grades on a curve. 2.2% 2.2% 34.1% 34.1% 0.1% 0.1% 13.6% 13.6% u-30 µ-20 µ-lo µ+lo µ+2o µt+3o It is known that the mean is 70 and the standard deviation is 5. There are 25 students in the class. If an exam paper is selected at random, what is the probability that it will be a failing paper? (Round your answer to three decimal places.) -9
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