The lifetime of a projector is known to be normally distributed with mean (u) 15 800 hours ani standard deviation (a) 620 hours. What is the probability that a projector will operate for longer than 14 000 hours? 1. 0.6236 2. 0.0019 3. -2.90 4. 2.90 5. 0.9981

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The lifetime of a projector is known to be normally distributed with mean (u) 15 800 hours an
standard deviation (a) 620 hours.
What is the probability that a projector will operate for longer than 14 000 hours?
1. 0.6236
2. 0.0019
3. -2.90
4. 2.90
5. 0.9981
45
Transcribed Image Text:The lifetime of a projector is known to be normally distributed with mean (u) 15 800 hours an standard deviation (a) 620 hours. What is the probability that a projector will operate for longer than 14 000 hours? 1. 0.6236 2. 0.0019 3. -2.90 4. 2.90 5. 0.9981 45
Bright 'n Shine Electricals specialises in electrical bulbs. The production manager estimates that
there is a 15% chance that a bulb will leave the production line with a defect.
Calculate the probability that out of the five bulbs that left the production line, at most one is
defective.
1. 0.0388
2. 0.1368
3. 0.2293
4. 0.8352
5. 0.1500
Transcribed Image Text:Bright 'n Shine Electricals specialises in electrical bulbs. The production manager estimates that there is a 15% chance that a bulb will leave the production line with a defect. Calculate the probability that out of the five bulbs that left the production line, at most one is defective. 1. 0.0388 2. 0.1368 3. 0.2293 4. 0.8352 5. 0.1500
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