Posted by **jamie** on Monday, April 18, 2011 at 1:09am.

a light bulb manufacture gaurentees that the mean life of a certain type of bulb is at least 875 hours. A random sample of 40 light bulbs has a mean life of 863 hours with a standard deviation of 50. a=0.04

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**PsyDAG**, Monday, April 18, 2011 at 3:41pm
What is your question?

- statitics -
**green**, Sunday, October 11, 2015 at 2:53pm
Work: A random sample of 100 light bulbs has a mean lifetime of 3000 hours. Assume that the population standard deviation of the lifetime is 500 hours. Construct a 95% confidence interval estimate of the mean lifetime

- statitics -
**Gladwin**, Sunday, June 5, 2016 at 8:51pm
What

percentage of light bulb fail to satisfy to guarantee

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