The mean marks of 10 different students were 65 . If Rohan's marks , 65 are excluded , the new MEAN will be
Answers
Answer:
Total marks=65×10=650
65 is excluded, 650-65=585 = marks of 9 students
mean =585/9=65
Given:
Mean = 65
No. of observation = 10
To find :
The new mean, If Rohan's marks 65 are excluded.
Formula to be used:
Mean = Sum of observations ÷ No. of observations
Solution:
Step 1 of 3 :
If the mean and no. of observations are given we can find the sum of observation using the following formula,
Sum of observation = Mean × No. of observations
Sum of observations = 10 × 65
Sum of observations = 650
Step 2 of 3 :
After the Rohan's marks 65 are excluded ,
Sum of new observation = 650 - 65
Sum of new observation = 585
No. of new observation = 10 - 1
No. of new observation = 9
Step 3 of 3 :
Therefore, The new mean will be
Mean = Sum of observations ÷ No. of observations
Mean = 585 ÷ 9
Mean = 65
Final answer:
If Rohan's marks 65 are excluded, the new mean will be 65.