An electrical company claims that the average life of the bulbs it manufactures is 1200 hrs. with the standard deviation of 250 hrs. If a random sample of 100 bulbs is chosen, what is the probability...



  1. An electrical company  claims that the average life of the bulbs it manufactures is 1200 hrs. with the standard deviation of 250 hrs. If a random sample of 100 bulbs is chosen, what is the probability that the sample mean will be.

  2. Greater than 1150 hrs.

  3. Less than 1250 hrs.

  4. Between 1150 and 1250 hrs.



Jun 11, 2022
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