Suppose that the life expectancy of a certain brand of nondefective light bulbs is normally distributed, with a mean life of 1200 hr and a standard deviation of 50 hr. The number of light bulbs that will last between 1130 hr hr is (Round to the nearest whole number.) If 30,000 of these bulbs are produced, how many will last between 1130 hr and 1260 hr?

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