have learned today CW PRACTICE PROBLEMS 1. The random variable X is normally distribution with / = 100 and o = 20, i.e. N(100, 20'). (a) Find the probabilities (i) P(X 130) (b) Sketch a diagram to represent the information in question (a). (c) Write down the standardized values of 90, 100, and 130. (d) Sketch a diagram, similar that of (b), containing the standardized values of 90, 100, and 130. stol bull to coutoys UI