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Asked by Karen

A company makes batteries with an average life span of 300 hours with a standard deviation of 75 hours. Assuming the distribution is approximated by a normal curve fine the probability that the battery will last .

Less than 250 hours

b. Between 225 and 375 hours

c. More than 400 hours
8 years ago

Answers

Answered by PsyDAG
Z = (score-mean)/SD

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability related to the Z scores.
8 years ago

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