(Show your solutions) The average life of a bread making machine is 7 years, with a standard deviation of 1 year. Assuming that the lives of these machines follow approximately a normal distribution, find а. the probability that the mean life of a random sample of 9 such machines falls between 6.4 and 7.2 years b. The value of x to the right of which 15% of the means computed from random samples size 9 would fall. (upload the picture of solution and roundoff your final answer into 5 decimal places)

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