exam Maths Puzzle Numerical Ability

Margaret Morris just correctly computed a standard deviation of 6.0 from a sample of 50 observations. What is the variance of Margaret�s sample?

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exam Other Question

find an equation of the line having the specified slope and containing the indicated point. Write answer in slope intercept form.

m=3; (0, -3) Solve the following equation for X by using the quadratic formula.

4x^2+2x-4=0