5.2,8.3,8.5,7.7,7.8,y; mean =7.8

Question

write and solve an equation to find the value of the variable

Answer 1

Is the mean (average) is 7.8 then the total of the scores is 6(7.8), or 46.8.

 

The sum of the other five numbers is 37.5.

The value of y = 46.8 - 37.5, or 9.3.