Question

If the average of 15 numbers is zero, then at least how many of them are positive?

Answer 1

Answer:

One

Step-by-step explanation:

Consider a set, of 14 negative numbers and only one positive number. If the positive number equals the sum of the negative numbers without the negative sign, the result is zero.

Simpler examples: [-1, -2, -3, 7], [-5, -14, -10, -1, 39, -9], so on.