exam Maths Puzzle Numerical Ability

y=-x^2
y=-4x^2
y=-6x^2

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Can you please help me with this. I do not understand how to do this.

Suppose that x has a distibution with u = 72 and o = 8.
if random samples of size n = 16 are selected, ca


-3{[(-2-3)-(-1-1)-2]-1}+2