The results of a survey of 800 married couples and the number of
children they had is shown below.
Number 

of Children 
Probability 

0 
.050 

1 
.125 

2 
.600 

3 
.150 

4 
.050 

5 
.025 
If a couple is selected at random, what is the probability that the couple will have
a.  less than four children? 
b.  more than two children? 
c.  either two or three children? 
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