What percentage of light bulbs have less life
If light bulbs have lives that are normally distributed with a mean of 2500 hours and a standard deviation of 500 hours, what percentage of light bulbs have a life less than 2500 hours?
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If light bulbs have lives which are normally distributed with mean of 2500 hours and standard deviation of 500 hours, what percentage of light bulbs have life less than 2500 hours?
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A standard deviation of 5 hours. What percentage of bulbs has lifetimes which lie within 1 standard deviation of mean on either side?
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