Answer:
The mean will be the best instrument to measure Royston's performance
Step-by-step explanation:
hope this helps
For this you would do

Because 60% is the same as 0.60. And solving a problem like this is the opposite of finding a percent of a number. When you solve this you get 80. So there are 80 students in total.
(4 x 4) - (4/4)
= 16 - 1
= 15