A student's scores on five tests are 98 , 99 , 86 , 89 and 70. What must the score be on the next test so that the average is 88 ? Choose an equation you would use to solve the given problem

x = 86

Step-by-step explanation:

The average of a set of data is equal to the sum of the numbers divided by

number of the sample. In our case we have

98, 99, 86, 89, 70 and x the uknown, and we know that the average need to be 88 so

(98+99+86+89+70+x) / 6 = 88

442 + x = 528

x = 528 - 442

x = 86