The average life of a bread-making machine is 7 years with

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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

a) 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 a; to the right of which 15% of the means computed from random samples of size 9 would fall.

Reference no: EM13576747

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