Let the mean and variance of 7 observations 
, be 8 and 16 respectively. Two numbers are chosen from 
one after another without replacement, then the probability, that the smaller number among the two chosen numbers is less than 4 , is:
Text Solution
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Mean 
(Given)
.
Variance 
(Given)
.
(sum is 14 product is 48 )
Since problem states 
and 
Now set 
Now we choose two numbers one after author without replacement total outcomes 
We want the prob. That the smaller number among the two is less than 4
smaller 
smaller 
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