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You are working in TV set factory. The manufactured TV has a normal distribution life with = 3,500 working hours and = 200 hours. 1.

You are working in TV set factory. The manufactured TV has a normal distribution life with = 3,500 working hours and

= 200 hours.

1. What is the probability that a TV will work less than 3,350 hours?

2. What is the probability that a TV will work more than 3,750 hours?

3. What is the probability that a TV will work between 3,350 & 3,750 hours?

4. What is TV life that you are confident 95% it will keep working

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