Hello
For question 12 the mode is the number that appears the most so the answer is 9
For question 13 to find the average you add all the number together and divide them by the amount added
So you can inverse this to find the missing value by doing the percent you got by the amount of numbers.
84 * 5 = 420
So all the grades equal 420
420 - 90 - 85 - 90 - 80 = 70
So the science grade is 70%
Hope this helps!
