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avatar+2390 

A person has a coin in which lands with a head showing 30% of the time. Express as a decimal the probability that she gets 2 heads and 1 tail when she tosses the coin 3 times.

 

So if a coin is flipped 10 times a head is shown 3 times and the tail is shown 7 times.


But I dont know how to continue

 Sep 15, 2019
 #1
avatar+104911 
+2

This is a bimomial probability problem

 

We flip the coin  3 times and we need to choose 2 of them to be heads....

 

So we have

 

C(3,2) (.30)^2 (.70)  = 189/1000  = .189  =  18.9%

 

 

cool cool cool

 Sep 15, 2019
 #2
avatar+2390 
+1

Oh... my math packet didn't mention. At least I learned something new today!

CalculatorUser  Sep 16, 2019

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