Question

The scores of a student in five tests: 10; 8; 13; x and 9. Knowing that the average (mean) of these five scores is 12, then x =

Answer 1

Answer:

20

Step-by-step explanation:

Given mean = 12

Total no. of score= 5

Mean = sum of the total no./ total no. of score

Mean= 10+8+13+9+x/5=12

(The 5 is in denominator in LHS when it goes to rhs it becomes multiply) so,

10+8+13+9+x=60. (12*5= 60)

40+x=60

x=60-40

x=20