The probability that a randomly selected light bulb will last between 825 hours and 900 is 0.477.
From the information given, a standard deviation below the mean will be:
= 750 - 75 = 675
Two standard deviations below the mean will be:
= 750 - 75(2)
= 600
In this case, we ant to know the probability that make up the areas. This is illustrated in the graph.
In conclusion, the correct option is 0.477.
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