# 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.

Question
416 views

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.

check_circle

star
star
star
star
star
1 Rating
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 :

Step 3

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

### Want to see the full answer?

See Solution

#### Want to see this answer and more?

Solutions are written by subject experts who are available 24/7. Questions are typically answered within 1 hour.*

See Solution
*Response times may vary by subject and question.
Tagged in