Question

3. The average of 20 numbers is zero. Of them, at the most, how many may be greater
than zero ?
(Hotel Management, 2002)
(a) 0
(b) 1
(c) 10
(d) 19​

Answer 1

Answer:

d)19

Step-by-step explanation:

Since average = Sum of all numbers/Number. of numbers,

For the average of 20 numbers to be zero, their sum must be zero.

For that, the magnitude of 19 numbers can be small and positive while that of the last number may be large and negative.

Did not understand? Take this example:

The numbers can be: 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19 and -190

Sum = 0 and hence average = 0

Here, 19 of the numbers are greater than zero.

Hence your answer is d)19

Hope this helped you

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