x New Tab You may need to use the appropriate appendix table or technology to an

Question

x New Tab You may need to use the appropriate appendix table or technology to answer this question. Need Help? 10 points A manufacturing plant uses light bulbs whose life spans are normally distributed, with mean and standard minimize the number of bulbs that burn out during operating hours, all the bulbs are replaced after a given period of operation. How often (in hr) should the bulbs be replaced equal to 600 and 40 hours, respectively. In order to if we wish no more than 1% of the bulbs to burn out between replacement periods? (Round your answer to two hr You may need to use the appropriate appendix table or technology to answer this question. Need Help? (a) Find a zo such that PCz > za)-0.0384. (Round your answer to two decimal places.) Find a zo such that

Explanation / Answer

2)

A) P(Z > z0 ) = 0.0384

Or, 1 - P(Z < z0) = 0.0384

Or, P(Z < z0) = 0.9616

Or, z0 = 1.77

B) P(Z < z0) = 0.9066

Or, z0 = 1.32

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