Question 265238
If a student had taken six tests and recieved scores of 88, 73,81,83,79 and 94 what would the 7th test score have to be to have a mean score of 83?

The average is given by the sum of the seven scores divided by the number of scores (that is 7). If X is the score on the 7th test then:

(88+73+81+83+79+94+X)/7 = 83

Solve the above for X.