+0  
 
0
54
1
avatar+32 

 

 May 7, 2020
 #1
avatar+23687 
+1

Add all of the frequencies    12 + 20 +........=  tf

 

Add frequencies of 4 or more    20 + 10

 

Probability =  (20 + 10) / tf

 May 7, 2020

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