a company observes the lifespan of 560 lightbulbs and finds that their data follows a normal distribution. what is the approxima te number of light bulbs that fall within two standard deviations from the mean?
1 answer:
Empirical rule can be used to estimate the number of values that lie with 1, 2 or 3 standard deviations of a Normally distributed population.This means, 532 bulbs will lie within 2 standard deviations from the mean
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