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The Lifespan Of Light Bulbs Is Normally Distributed, With A Mean Life Of 850 Hours, And A Standard Deviation Of 20 Hours.
A) What Would Be The Expected Lifespan Of Approximately 99% Of The Light Bulbs?
B) What Percentage Of Light Bulbs Should Last For At Least 830 Hours? - Math Discussion

The lifespan of light bulbs is normally distributed, with a mean life of 850 hours, and a standard deviation of 20 hours.
a) What would be the expected lifespan of approximately 99% of the light bulbs?
b) What percentage of light bulbs should last for at least 830 hours?