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Section 13.7 Week 9 Assignment

  1. Check that this is a probability density function. Then calculate the mean and the standard deviation. (8)
    \begin{align*} \amp p(x) = \frac{3}{14} (x^2 + x) \amp \amp x \in [0,2] \end{align*}
  2. Check that this is a probability density function. Then calculate the mean and the standard deviation. (8)
    \begin{align*} \amp p(x) = \frac{3}{x^4} \amp \amp x \in [1,\infty) \end{align*}
  3. Probability density functions describe the probability of certain measurements. The maximum probability is 1; an event or measurement with probability 1 is certain to happen. Explain how the probability density function itself can have values larger than 1 and still work to calculate probability. (3)