Each year, a large warehouse uses thousands of fluorescent light bulbs that burn 24 hours per day until they burn out an

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Each year, a large warehouse uses thousands of fluorescent light
bulbs that burn 24 hours per day until they burn out and are
replaced. The lifetime of the bulbs is a normally distributed
random variable with mean equal to 600 hours and standard deviation
of 12 hours.
The warehouse manager orders a shipment of 500 light bulbs each
month. How many of the 500 bulbs are expected to have a lifetime
that is less than 582 hours ( Round your answer to one decimal
place)
466.6
33.4
498.5
7.5
482.0