Answer:
total marks = 600
Step-by-step explanation:
The average of a data set is calculated as
average = [tex]\frac{sum}{count}[/tex]
given there 20 students, then count is 20 and average is 30, then
[tex]\frac{sum}{20}[/tex] = 30 ( multiply both sides by 20 )
sum = 20 × 30 = 600
the total marks earned by the class is 600
