Answer:
2
Step-by-step explanation:
If you think that you are going to be dividing the final number by 4 to get five, you set up a simple equation (18+x)/4=5
Mean is the average.
For 4 scores to have an average of 5, the total points would need to equal 5 x 4 = 20
the total of the first 3 scores is: 10 + 5 + 3 = 18
The final score would need to be 20-18 = 2
