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The standard deviation of 2000 hours was calculated as 300 hours. Calculate the probability of being...

The standard deviation of 2000 hours was calculated as 300 hours. Calculate the probability of being more than 2100 hours ?, less than 1900 hours. If a customer who bought the bulbs claims that the light bulbs last for 1800 hours and would like the bulbs to be replaced, what would your decision be? Please explain doing the necessary calculations.

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