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A big factory installed 900 light bulbs in their extended facility. Assume that their (bulbs) length of life follows a normal distribution with a mean

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A big factory installed 900 light bulbs in their extended facility. Assume that their (bulbs) length of life follows a normal distribution with a mean life of 125 days and a variance of 324 squared days. What is the expected number of bulbs that expire in less than 90 days? O a. 74 O b. 41 O c. 34 O d. 24 O e. 30

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