Question: i need help with finding the probability that a light bulb of that brand lasts Suppose a brand of QM bulbs is normally dislributed: with

i need help with finding the probability that a light bulb of that brand lasts

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 (Type an integer or decimal rounded lo ieur decimal places as needed.)

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