Marks scored by some children in an arithmetic test are:5, 3, 6, 9, 4, 7, 8, 6, 2, 7, 8, 4, 5, 2, 1, 0, 6, 9, 0, 8.
The arithmetic mean of the marks is
 

  • A 6
  • B 5
  • C 8
  • D 7
  • E 10
jamb 1981mathematics

The correct answer is B. 5

To find the arithmetic mean (average) of these marks, you need to sum up all the marks and then divide by the total number of marks.

Sum of the marks: 5 + 3 + 6 + 9 + 4 + 7 + 8 + 6 + 2 + 7 + 8 + 4 + 5 + 2 + 1 + 0 + 6 + 9 + 0 + 8 = 95

There are 20 marks in total.

Now, calculate the arithmetic mean:

Arithmetic Mean = Sum of Marks / Total Number of Marks
Arithmetic Mean = 100 / 20

Arithmetic Mean = 5

So, the arithmetic mean of the marks is 5

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