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In: Statistics and Probability

Suppose that the life expectancy of a certain brand of nondefective light bulbs is normally​ distributed,...

Suppose that the life expectancy of a certain brand of nondefective light bulbs is normally​ distributed, with a mean life of 1100 hr and a standard deviation of 50 hr.

If 70,000 of these bulbs are​ produced, how many can be expected to last at least 1100 hr?

The number of light bulbs that can be expected to last at least 1100 hr is ______.

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orchestra answered 2 years ago
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