Q6. Suppose that the longevity of computers supplied by company A, say X, follows normal distribution with mean 38 months and standard deviation 3 months i.e. X~N(38, 9). It is also supposed that the longevity of computers supplied by company B, say Y, follows normal distribution with mean 38 months and standard deviation 1.5 months. [2+4] (1) Sketch the distributions of longevity of company A and B in a single graph, and hence comment on the variability of the two distributions (ii Calculate the probability that a randomly selected computer supplied by company A will last between 36.5 months to 40.8 months