Probability that mean life time of bulbs is at least hours

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Reference no: EM13135640

A manufacturer claims that the average life of its light bulb is 1,200 hours. Assume that the life of all such bulbs has a normal distribution with mean 1,200 hours, and standard deviation 70 hours. Determine the probability the mean life time of a random sample of 9 bulbs will be:

a) At least 1,180 hours.
b) Between 1,185 and 1,190 hours

Reference no: EM13135640

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