1) The total cost for a production process is equal to $900 plus two times the number of units produced. The mean and variance for the number of units produced are 800 and 600, respectively. Find the mean and variance of the total cost

Part 1

The mean of the total cost is?

Part 2

The variance of the total cost is?

2) The number of hits per day on the Web site of a tool company is normally distributed with a mean of

700 and a standard deviation of 140.

a. The proportion of days with more than 820 hits is?

(Round to four decimal places as needed.)

b. The proportion of days with between 740 and 820 hits is?

c. Only 10% of the days will have less than ____hits.