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Posted: **Thu May 05, 2022 11:47 am**

: It Is Known That The Mean Life Of Light Bulbs Is 2400 Hours And Standard Deviation Of 62 Hours For A Total Of 4000 Ligh 1 (15.44 KiB) Viewed 32 times

It is known that the mean life of light bulbs is 2400 hours and standard deviation of 62 hours. For a total of 4000 light bulbs, how many bulbs will have a life of 2500 hours or more? a) 214 b) 123 c) 521 d) 424