Many electronic devices use disposable batteries, which
eventually have to be replaced. Assume that for one
particular brand and type of battery, the distribution of
the hours of useful power can be approximated well by a
Normal model. The mean is 140 hours, and the standard
deviation is 4 hours.
a) Using the 68-95-99.7 Rule, sketch the appropriate
b) The marketing department wants to write a guarantee
for battery life. What lifespan should they quote so
that they can expect 98% of the batteries to meet the
c) The company’s research department has been given
the task of improving the batteries, with a goal that
at least 90% of the new batteries should last longer
than the average of the current type. Initial research
suggests that a mean of 143 hours is attainable. What
other improvement must they make to achieve their
d) Explain what the improvement you suggest in part c
would mean about the new batteries.
Delivering a high-quality product at a reasonable price is not enough anymore.
That’s why we have developed 5 beneficial guarantees that will make your experience with our service enjoyable, easy, and safe.
You have to be 100% sure of the quality of your product to give a money-back guarantee. This describes us perfectly. Make sure that this guarantee is totally transparent.Read more
Each paper is composed from scratch, according to your instructions. It is then checked by our plagiarism-detection software. There is no gap where plagiarism could squeeze in.Read more
Thanks to our free revisions, there is no way for you to be unsatisfied. We will work on your paper until you are completely happy with the result.Read more
Your email is safe, as we store it according to international data protection rules. Your bank details are secure, as we use only reliable payment systems.Read more
By sending us your money, you buy the service we provide. Check out our terms and conditions if you prefer business talks to be laid out in official language.Read more