Three integers are randomly selected without replacement from the set { 1,2,3,5,6,7}. What is the probability that the mean of the values chosen is less than, but not equal to, 5?

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- February 2nd 2010, 02:07 AMsri340integers
Three integers are randomly selected without replacement from the set { 1,2,3,5,6,7}. What is the probability that the mean of the values chosen is less than, but not equal to, 5?

- February 2nd 2010, 02:53 AMarze
since the mean is less than 5, the sum of the 3 numbers will be less than or equal to 12. so find the sums of three of the numbers in the set that are less or equal to twelve.

- February 7th 2010, 12:29 PMMorlafanswer
i make 4/5.

if you need me to elaborate (or if you disagree) please let me know.....

thanks,

Morlaf - February 7th 2010, 01:09 PMPlato
- February 7th 2010, 03:48 PMarze