1.38 Problem 1.61 Problem 1.78. Here x denote the sample mean of the {xi}, s 2 denote the sample variance of the {xi}, and s the sample standard deviation of the {xi}. Problem 2.4 Problem 2.12 Problem 2.18 Other Problem 1: The weather forecaster says that the probability of rain on Saturday is 25% and that the probability of rain on Sunday is 25%. Is the probability of rain during the weekend 50%? Why or why not