A new extended-life light bulb has an average service life of 750 hours, with a standard deviation of 50 hours. The shape of this distribution is unknown. From a sample of 100 light bulbs, about what percent of the bulbs will last more than 700 hours?
A) 100%
B) 34.13%
C) 84.13%
D) 50%
E) None of the choices are correct

Question

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The Answer of A new extended-life light bulb has an average service life of 750 hours, with a standard deviation of 50 hours. The shape of this distribution is unknown. From a sample of 100 light bulbs, about what percent of the bulbs will last more than 700 hours?
A) 100%
B) 34.13%
C) 84.13%
D) 50%
E) None of the choices are correct

A New Extended-Life Light Bulb Has an Average Service Life