Use the table to answer the question. Note: Round z-scores to the nearest hundredth and then find the required A values using the table. A manufacturer of light bulbs finds that one light bulb model has a mean life span of 1030 h with a standard deviation of 89 h. What percent of these light bulbs will last as follows? (Round your answers to one decimal place.) (a) at least 980 h. 21.2 X% (b) between 810 and 880 h 3.9 %

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