exam
Maths Puzzle
Numerical Ability
A line passing through the origin has slope -3. Determine the value of a, if the line is to contain the point (a, -1).
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exam Other Question
Find the mean and standard deviation of the following discrete random variable.
Number of siblings: X| 1 2 3 4 5
Probability P(X=x): |0.200| 0.425| 0.275|0.075|0.025
1 goes on top 0.200 2 goes on top 0.425 etc.
factor compeletly:
2x cubed + x squared - 72x -36