A manufacturer of light bulbs finds that one light bulb model has a mean life span of 1023 h with a standard deviation of 84 h. What percent of these

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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 1023 h with a standard deviation of 84 h. What percent of these light bulbs will last as follows? (Round your answers to one decimal place.)

(a) at least 910 h
%

(b) between 830 and 880 h
%
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