Maths Question 急

👨🏻‍🏫 學術台數學

Scarbo

2009-02-21 7:27 am

n an exam, he mean mark of the whole class is 85 marks. The dfferences between the marks of 10 students in the class and the mean mark of the whole class are as follows (uni :marks):
3, 10,-2,28,6,0 ,15,-8,-1,9.
What is the mean mark of the 10 students?

Answer : 87.4 marks

點計嫁？
請列式。

Thank you !!

更新1:

In an exam, he mean mark of the whole class is 85 marks. Sorry 漏左個I字 Answer : 87.4 marks

回答 (1)

用戶2053

2009-02-21 8:02 am

✔ 最佳答案

可這樣計:先將10個student的mean mark分數差加起來再除以10,然後加上mean mark 85:

85 + [3 + 10 + (-2) + 28 + 6 + 0 + 15 + (-8) + (-1)+ 9 ] / 10

= 85 + 60/10

=85 + 6

=91 (marks)

而你的Answer 87.4是錯的,或者是題目的數據有錯。

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