+0  
 
+2
41
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avatar+479 

I don't understand how to do this.

 Feb 19, 2019
 #1
avatar+98126 
+4

Remember that the sum of the probabilities = 1

 

So we have

 

n + 1/3 + 1/8 + 1/6 =  1

 

n + 8/24 + 3/24 + 4/24 =  1

 

n +  [ 8 +  3 + 4 ] / 24 = 1

 

n + [ 15/24] =  1

 

 n +   5/8  =   8/8        subtract   5/8 from both sides

 

n =  3/8

 

 

cool cool cool

 Feb 19, 2019

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