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Author Question: A test-scoring machine is known to record an incorrect grade on 5 of the exams it grades. Find by ... (Read 66 times)

kellyjaisingh

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on: Jul 24, 2018
A test-scoring machine is known to record an incorrect grade on 5 of the exams it grades. Find by the appropriate method, the probability that the machine records no more than 2 wrong grades in a set of 15 exams.

Question 2

A test-scoring machine is known to record an incorrect grade on 5 of the exams it grades. Find by the appropriate method, the probability that the machine records no more than 2 wrong grades in a set of 10 exams.


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sultansheikh

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Reply #1 on: Jul 24, 2018
Answer to Question 1

P(no more than 2 wrong in 15) = Px = 0,1, 2  B (n = 15, p = 0.05)
= 0.463 + 0.366 + 0.135 = 0.964

Answer to Question 2

P(no more than 2 wrong in 10) = Px = 0, 1, 2  B(n = 10, p = 0.05)
= 0.599 + 0.315 + 0.075 = 0.989


kellyjaisingh

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Reply 2 on: Jul 24, 2018
Great answer, keep it coming :)

ricroger

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Reply 3 on: Yesterday
YES! Correct, THANKS for helping me on my review

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