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# Online professor's response to: normal distribution

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Always get overwhelmed by the amount of material when covered at a comprehensive level. Attached is the study material of what to be prepared to cover at the conclusion of this course. I have worked through them but get stumped at several points. Can you provide a systematic approach to these problems and provide a reference to refer to make sure my solutions are accurate. It would helpful if you can explain why you did what you did, as this is just a helpful of study and questions may appear differently at the actual conclusion of the course.

The length of time to do a cable installation by Multi-Cable Inc. is normally distributed with a mean of 42.8 minutes and a standard deviation of 6.2 minutes. Refer to Table 6A on the Handout for MegaStat output.
Multi-Cable wants to establish how long a standard cable install appointment should be to insure that all work will be completed during the appointment 90% of the time. How long would you recommend the standard cable installation appointment be?

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Let X denote the length of time to do a cable installation by Multi-Cable Inc. Here Multi-Cable wants to establish how long a standard cable install appointment should be to ...

#### Solution Summary

The solution contains the discussion of the following problem "The length of time to do a cable installation by Multi-Cable Inc. is normally distributed with a mean of 42.8 minutes and a standard deviation of 6.2 minutes. Multi-Cable wants to establish how long a standard cable install appointment should be to insure that all work will be completed during the appointment 90% of the time. How long would you recommend the standard cable installation appointment be?"

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