Suppose a brand of ”QM bulbs is normally dislributed: with a mean life of 1200 hr and a standatd deviation of Areas Undet the 50 hr Standard NDn’nal Curve Find the probability thal a light bulb aflhat biand lasts between 1140 hr and 1260 hr. The prubabilily 11131 a light bulb will last between 11:10 hr and 1260 hr is
Suppose a brand of ”QM bulbs is normally dislributed: with a mean life of 1200 hr and a standatd deviation of Areas Undet the
50 hr Standard NDn’nal Curve Find the probability thal a light bulb aflhat biand lasts between 1140 hr and 1260 hr. The prubabilily 11131 a light bulb will last between 11:10 hr and 1260 hr is