Question

The mean value of marks obtained by 20 students in class is 25 marks. If 10 marks is added to every student what is the new mean?

Answer 1

Answer:

The new mean is 11.25.

Hope this helps you

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Answer 2

Answer:

The new mean is 1 1 . 2 5

Explanation:

Given : The mean value of marks obtained by 2 0 students in class is 2 5 marks. If 1 0 marks is added to every student

To find : what is the new mean

Solution :

10 marks added for each Student = 1 0 * 2 0 = 2 0 0

2 5 +  2 0 0 / 2 0

= 2 2 5 / 2 0

= 2 2 . 5 / 2

=  1 1 . 2 5

.. The new mean is 1 1 . 2 5

You only need to add up all the numbers in a data set and divide the result by the total number of values to determine the arithmetic mean of the data set.

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