Question

Lisa's test grade are 79, 89 and 90.

If there is one more test, and she wants her average score to be 88, what is the lowest score she can get?

Answer 1

The lowest score Lisa should score is 94

Explanation:

Average/Mean:

Let the score of the fourth test be 'x'.

It is given that the average score is 88.

`\sf Average = (Sum \ of \ all \ data )/(number \ of \data)`

`\sf (79+89+90+x)/(4)=88\\\\\\79 + 89 +90 + x = 88 * 4`

258 + x = 352

x = 352 - 258

x = 94