The mean price of a new laptop computer from Store #1 is $799.99, and they only sell two brands of computers. The mean price of a new laptop from another store is $679.99, and Store #2 sells 4 brands. What is the weighted mean average of a new laptop computer?
value Weighted mean average = --------------------------- number of brands
value = mean price of computers from Store
#1 * number of brands from store #1 + mean price of computers from store #2 * number of brands from store #2
