Lisa makes clothes for pets. She needs yard 4/6 yard of fabric to make 1 dog coat.
How much fabric does she need to make 4 dog coats?

Lisa needs
6 yards of fabric to make 4 dog coats.

                           

Step-by-step explanation:

The mode is the number that apears the most times in a set of data 
what you should do is list the numbers from least to greatest because it helps so the numbers are now listed as 3,6,6,6,7.8.8.8.9.12.15 as you can see  there are two modes there is 6 and 8 now you have to find the average or you can use the number in the middle of 6,8  
6+8=14/2=7
 6,7,8