There are no random values added. Start by putting the median (middle) number which is 82. It will be the 3rd number since we have a total of 7 numbers. Then we'll put the lowest score which is 70. After 82 put 87 twice since it's the mode ( the number that repeats the most). Now we have to find the largest possible score ( the 7th number ) that will give us an average of 80. This means that the 2 numbers following 70 should be 71 and 72. Set it up like the solution shows and you get 91.
and we put 71 and 72 because these are the lowest possibilities that can give us the highest value for the x
Yes that is correct.
