the life expectancy of a typical light bulb is normally distributed with a mean of 2000 hours and a standard deviaton of 27 hours. what is the probability that a lightbulb will last between 1975 and 2050 hours?
a.)0.17619
b.)0.32381
c.)0.79165
d.)0.96784

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Idk what that is

A z-table I mean

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