SOLUTION: 3.An electrical company claims that the average life of the bulbs it manufactures is 1200 hours with a standard deviation of 250 hours. If a random sample of 100 bulbs is chosen,

Algebra ->  Probability-and-statistics -> SOLUTION: 3.An electrical company claims that the average life of the bulbs it manufactures is 1200 hours with a standard deviation of 250 hours. If a random sample of 100 bulbs is chosen,       Log On


   

Question 1136666: 3.An electrical company claims that the average life of the bulbs it manufactures is 1200 hours with a standard deviation of 250 hours. If a random sample of 100 bulbs is chosen,
Answer by ikleyn(52803) About Me  (Show Source):
You can put this solution on YOUR website!
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Fix; then re-post to the forum.


Do not post to me personally (please).



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Comment from student: 3.An electrical company claims that the average life of the bulbs it manufactures is 1200 hours
with a standard deviation of 250 hours. If a random sample of 100 bulbs is chosen,
a.What are the mean and standard error of the sampling distribution? (3 pts.)
b.What is the probability that the sample mean will be: b.1 At least 1150 hours? (4 pts.)
b.2 Less than 1250 hours? (4 pts.)
b.3 Between 1150 and 1250 hours? (4 pts.)
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My response :   As I said,  do not post to me personally  (please).

            Re-post to the forum.