a computer must pass through 5 traffic lights on her way to work, and will have to stop at each one that is red . Based on the random variable X defined below, she expects that she will hit 2.29 red lights on her way to work that the variance for the number Of red lights she will hit is 1.706, and that the standard deviation is 1306 X = # of red 0 1 3 4 5 P ( X = x) 1.051.25, 34 , 15.14 . 07 a ) find the expected value for the number of red lights she will hit as a 5 - day work week expected values standard deviation =