zahnjoey2470
29.05.2020 •
Mathematics
The average test mark of the class? mark of a class of 20 student is 65. Twum's mark was recorded as 35 instead of 55. What is the correct average mark of the class
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Ответ:
66
Step-by-step explanation:
Wrong total mark = 65 * 20 = 1,300
remainder of Tum score to be added= 55-35 = 20
Add this to total = 20 + 1300 = 1320
Correct average score = 1320/20 = 66
Ответ: