Question

The average marks of a student in seven subjects is 41. after reevaluation in one subject the marks were changed to 42 from 14 and in remaining subjects the marks remain unchanged. what are the new average marks?

Answer 1

Hope it helps you!!!

Answer 2

Answer:

45

Step-by-step explanation:

We are given that the average of average marks of a student in seven subjects is 41.

$Average = \frac{\text{Sum of all observations}}{\text{total no. of observations}}$

$41 = \frac{\text{Sum of all marks}}{7}$

$41 \times 7 =\text{Sum of all marks}$

$287 =\text{Sum of all marks}$

So, sum of all marks = 287

Now we are given that after reevaluation in one subject the marks were changed to 42 from 14

So, new sum of marks = 287-14+42 =315

So,$\text{new Average} = \frac{\text{New Sum}}{\text{total no. of observations}}$

$\text{new Average} = \frac{315}{7}$

$\text{new Average} =45$

Hence the new average of marks is 45