Suppose that we want to install new photocells for a house in Calgary. There are 2 types available in market. Assume that the life length of the photocell from manufacturer 1 have normal distribution with an average of 15 years and variance of 25. Also assume that the life length of the photocell from manufacturer 2 have normal distribution with an average of 20 years and variance of Q. a. If we want to use the photocell for 2D years, which manufacturer would be preferred? (Compare using calculated probabilities} b. If we want to use it for 17 years, which manufacturer is preferred? {Compare using calculated probabilities)