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A set of values has a mean of 250 and a standard deviation of 50. What value has a z-score of -2.4? Find the directional derivative of the given function at the point (2, 4, -1)? Which size of spray tips is more better for 150mm diameter pipe to control the loss factor? F(x, y) = (1 + 5xy)^(3/2) then nabla(f( x, y) is? The Ka of a monoprotic weak acid is 8.34 × 10-3. What is the percent ionization of a 0.196 M solution of this acid?