Question

The mean price of a new laptop computer from Store #1 is $849.99, and they only sell three brands of computers. The mean price of a new laptop from another store is $729.99, and Store #2 sells 4 brands. What is the weighted mean average of a new laptop computer?

Answer 1

\[\frac{3*849.99+4*729.99}{7}=781.42\]

Answer 2

see where we get the 3 and 4 ?

Answer 3

if the mean price from the first store is 849.99 and there are three brands then the sum of the costs of the three brands must be 2549.97; if you then divide that by 3 you get the store 1 mean