1.In an urn there are 20 balls, 10 of them are red and 10 are green. 5 balls are drawn at random without replacement. What is the probability that exactly 3 of the balls drawn are red? a) 0.438 b)0.482 c) 0.248 d) 0.348

1.In an urn there are 20 balls, 10 of them are red and 10 are green. 5 balls are drawn at random without replacement. What is the probability that exactly 3 of the balls drawn are red? a) 0.438 b)0.482 c) 0.248 d) 0.348

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

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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Question

answer the following multiple choice questions:

1.In an urn there are 20 balls, 10 of them are red and 10 are green. 5 balls are drawn at random without replacement. What is the probability that exactly 3 of the balls drawn are red?

a) 0.438 b)0.482 c) 0.248 d) 0.348

2.In a cookie factory, 10% of the cookies produced are defective. If 8 cookies are randomly selected from a lot, what is the probability that exactly 2 are defective?

a) 0.941 b)0.159 c) 0.951 d) 0.149

3. At a university, 40% of the students pass the statistics exam. If a class of 25 students is drawn at random, what is the probability that exactly 10 pass the exam?

a) 0.1126 b) 0.1612 c) 0.1216 d) 0.1621

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