Question
Asked Apr 11, 2019
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An urn contains two red balls and five blue balls 

A. Draw three balls at random drom the urn, without replacement. Compute the expected number of red balls in your sample. 

 

B. Draw three red balls at random from the urn, with replacement Compute the expected number of red balls in your sample. 

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Expert Answer

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Step 1

Given that there are 2 red balls and 5 blue balls.

The total number of ways no. of ways in which 3 balls can be drawn from 7balls  = 7C3  = 35

Step 2

(a) Now, we need to draw three balls at random from the urn, without replacement :

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Step 3

Thus, the expected number of red balls in your sampl...

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Math

Probability

Random Processes

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