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A Company Manufactured 2000 electric bulbs it was found that life time of a bulb was normally distributed with an average life of 180 days

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A Company Manufactured 2000 electric bulbs it was found that life time of a bulb was normally distributed with an average life of 180 days and standardiviation of 30days. 0n the basis of the information, estimate the number of bulbs that is expected to burn for A] More than 210 days B] Less than 135 days

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