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,

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)   (Show Source): You can put this solution on YOUR website!
.

The post was interrupted and broken.

Fix; then re-post to the forum.

Do not post to me personally (please).

----------------
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.)
----------------

My response :   As I said, do not post to me personally (please).

            Re-post to the forum.

RELATED QUESTIONS
An electrical company claims that the average life of the bulbs it manufactures is 1200... (answered by CPhill)

"An electrical firm manufactures light bulbs that have a length of life that is... (answered by CPhill)

. An electrical firm manufactures light bulbs that have a length of life that is normally (answered by stanbon)

A company manufactures light bulbs and wants to advertise a me an life of 1200 hours for... (answered by ewatrrr)

Please help me. t distribution related problem. Acme corporation manufactures light... (answered by Positive_EV)

1. Liwanag Bulb Company claims that it sells light bulbs with an average life of 1000... (answered by Theo)

A light bulb company claims that the 40 watt light bulb it sells has an average life of... (answered by Theo)

A light-bulb manufacturer claims that the light bulbs produced by his company have an... (answered by stanbon)

An electrical firm manufactures incandescent light bulbs that have a length of life (in... (answered by Theo)