Answer Happy

Q4)(15 points) The waiting time W for accessing one record from a computer database is a random variable uniformly distributed between 0 and 10 milliseconds. The read time R (for moving the information from the disk to main memory) is 6 milliseconds. The random variable X is the total access time (waiting time + read time) to get one block of information from the disk. Before performing a certain task, the computer must access 20 different blocks of information from the disk. (Access times for different blocks are independent of one another. The total access time for all the information is a random variable A in milliseconds( ms). a) What is the average of X? b) What is the variance of X? c) What is the average of A? d) What is the variance of A? e) Use the Central Limit Theorem to estimate P(A < 150 ms). Provide your solution in terms of the function.