+0  
 
0
38
1
avatar

20% of the shoes in the factory are black. One shoe is chosen and replaced. A second shoe is chosen and replaced. Then a third shoe is chosen. What is the probility that none of the shoes are black?

off-topic
Guest May 6, 2018
edited by Guest  May 6, 2018
Sort: 

1+0 Answers

 #1
avatar+404 
+1

The probability of not drawing a black shoe is 4/5. Since you replace the shoe each time, you multiply 4/5 by 4/5 by 4/5, which equals 64/125. The probability of not drawinga black shoe is 64/125.

 

Donut🍩🍩🍩

Donut  May 7, 2018

11 Online Users

avatar
New Privacy Policy (May 2018)
We use cookies to personalise content and ads, to provide social media features and to analyse our traffic. We also share information about your use of our site with our social media, advertising and analytics partners.  Privacy Policy