Lisa's test grades are 79, 89 and 90
2 answers:
- Mean=Sum of data/No of data
So
Let that be n
- n+79+89+90/4=88
- n+258/4=88
- n+258=352
- n=94
Answer:
<u>94</u>
Step-by-step explanation:
Equating the mean to the scores :
- 88 = 79 + 89 + 90 + x / 4
- 352 = 258 + x
- x = <u>94</u>
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