Mathematics, 05.04.2021 14:00 riplilsnupe023

A certain brand of flood lamps has a lifetime that is normally distributed with a mean of 3,750 hours and a standard deviation of 300 hours.

(a) What proportion of these lamps will last for at least 4,000 hours?

(b) What proportion of these lamps will last between 3,600 and 4,000 hours?

(c) What proportion of these lamps will last less than 3,800?

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A certain brand of flood lamps has a lifetime that is normally distributed with a mean of 3,750 hou...

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