exam Maths Puzzle Numerical Ability

For the following probability distribution u=_____

xi 250/300/400
pi 0.30/0.50/0.20

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exam Other Question

the equation of a line yhat is perpendicular to the line y=-3x+4 6xy^3 * 35x^4y^5 * 33y
----- -------- ----- =
5x^2 22xy^2 14x^5

I can't seem to get the problem to