Question

10-11. A supermarket sells only two types of coffee products, coffee and cream. The store expects to sell $200 worth of coffee and $50 worth of cream each day. The inventory manager is looking at the standard deviation of daily coffee sales, which is $4, and the standard deviation of cream sales, which is $6 dollars. Suppose the correlation coefficient between coffee and cream is 0.9375. They expect to sell a total of $250 worth of coffee products (coffee and cream combined). What is the standard deviation of this supermarket's daily sale on coffee products (coffee and cream combined)? Show all your work. 12. Ben rolls a regular die ten times and adds up the number of dots. How many dots does he expect to get? 13. Let's continue with the above question: Ben's friend, Polly, wants to know what the variance for the number of dots is going to be (when the die is rolled ten times). What is it?

Answer 1

1 2 in each thrn of die expecfed numler j ,L了 2 I Variance of no. of 려oto ., n orn fin- 2. (3, S 一 12.25 6 Vor (no of dots)= 29-2 in lo dva vn er die

So of sell of Coffee pndus worth 2s e, c= weight of sen of coffee O o 0.8 2 2. ん 3.904 3401 wort Answer isF 3.901