Question 1136666
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Fix; then re-post to the forum.



Do not post to me personally (please).




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<U>Comment from student</U>: 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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<U>My response</U> :  &nbsp;&nbsp;As I said, &nbsp;do not post to me personally &nbsp;(please).


&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Re-post to the forum.