For a brand, the life of light bulbs (b) are normally
distributed with a mean of 750 hours and a standard
deviation of 75 hours. Find the probability that a given
light bulb lasts between 525 and 750 hours.
-99.7%-
-95%-
-68%-
525 600 675 750 825 900 975
P(525
Be sure to use the 68% - 95% -99.7% rule and do not round.
Enter
