Math, asked by kandalauday8595, 1 year ago

The average marks of a group of 20 students on a test is reduced by 4 when the topper who scored 90 marks is replaced by a new student. How many marks did the new student have?

Answers

Answered by dharmpal13
1

Answer:

90 marks is replaced by a new student.

Answered by windyyork
6

The new student has 10 marks.

Step-by-step explanation:

Since we have given that

Number of students on a test = 20

Let the average marks be 'x'.

So, it becomes ,

\dfrac{\sum x}{20}=x\\\\\sum x=20x

Average reduced by 4 when the topper who scored 90 marks replaced by a new student.

So, it becomes,

\dfrac{20x-90+N}{20}=x-4\\\\20x-90+N=20(x-4)\\\\20x-90+N=20x-80\\\\N=-80+90\\\\N=10

Hence, the new student has 10 marks.

# learn more:

The average score of 18 students in a class test in maths is 35.If the top three ranker's are removed average drops by 2.If the paper is out of 50 marks and the 2nd highest score is less than 45,then what should be the least highest (3rd topper) score if all scores are integers.

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