The number of times my computer crashes each hour has a Poisson distribution with parameter 3. Tomorrow I will use the computer for T hours, where T is uniformly distributed on {2, 3, 4, 5 ). The number of computer crashes in one hour is independent of that of other hours. The number of crashes each hour is also independent from the number of hours I use the computer. Find the variance for the total number of crashes on my computer tomorrow. Give your answer in 1 decimal place