The life (in hours)of light bulbs of a certain brand is normally distributed with mean 1200 and standard deviation 100.What percentage of such bulbs will burn more than 1250 hours?
A) 13.62
B) 20.47
C) 30.85
D) 41.73
E) 48.26

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The Answer of The life (in hours)of light bulbs of a certain brand is normally distributed with mean 1200 and standard deviation 100.What percentage of such bulbs will burn more than 1250 hours?
A) 13.62
B) 20.47
C) 30.85
D) 41.73
E) 48.26

The Life (In Hours)of Light Bulbs of a Certain Brand