4.8 Let X be a random variable whose pdf is given by the plot in Figure 4.10. Assume that the pdf is zero outside of the interval given in the plot. 0.25 0.20 0.15 likelihood 0.10 0.05 0.00 -4 -2 0 2 6 X Figure 4.10: PDF of X a. Estimate the mean of X b. Estimate the standard deviation of X. c. For which a is P(a