Posted by **david** on Sunday, June 23, 2013 at 9:51pm.

6. According to the records of Enersource, an electric company serving the Mississauga area, the mean electricity consumption for all households during winter is 1650 kilowatt-hours per month. Assume that the monthly electricity consumption during winter by all households in this area have a normal distribution with a mean of 1650 kilowatt-hours and a standard deviation of 320 kilowatt-hours

a) Find the probability that the monthly electricity consumption during winter by a randomly selected household from this area is less than 1950 kilowatt hours.

b) What percentage of the households in this area has a monthly electricity consumption of 900 to 1300 kilowatt- hours?

- statistics -- Stop! -
**Ms. Sue**, Sunday, June 23, 2013 at 10:00pm
Before you post any more questions, please go back and post your thoughts and attempts to solve these problems.

Certainly you're not trying to get us to give you the answers!!!

- statistics -
**Kuai**, Sunday, June 23, 2013 at 10:03pm
a. z = (x-mean)/ sd = (1950-1650)/320

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