Thread: integers

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?

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.

i make 4/5.
if you need me to elaborate (or if you disagree) please let me know.....

thanks,
Morlaf

Originally Posted by arze

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.

The mean of is less than five, but .

Originally Posted by Plato

The mean of is less than five, but .

oops! my bad thanks for pointing out!