Infosys Company Numerical Ability Probability

One number, n, is selected at random from a set of 10 integers. What is the probability that ½ n + 13 = 0 ? The largest integer in the set is 13. The arithmetic mean of the set is zero?

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n/2 + 13 = 0
-> n= -26

Question is asking what is the probability that n will be -26.

The largest integer in the set is 13.

-26 may / may not be present in the set of 10 integers even when largest integer is 13.
hence insufficient

The arithmetic mean of the set is zero.
Arithmetic means is 0 means that the sum of the numbers is 0.
This also doesnt tell anything about -26 in the list.

Combining:
set can be
-1,-2,-3,-4,-3,-6,-7,7,6,13
In this case probability that n is -26 is 0
set can be:
-26,-13,13,13,13,2,-2,-1,1
in this case probability is 1/10
and we have lot of combinations like this...

Hence insufficient
12 years agoHelpfull: Yes(13) No(0)

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