Home
Class 12
MATHS
There are 20 students in a class. The me...

There are 20 students in a class. The mean value of their scores is 135. On rechecking, two mistakes were found . After correction, the marks of one student was increased by 35 and the marks of the other was decreased by 15.What is the mean value of the marks after correction?

A

135.5

B

136

C

155

D

134.5

Text Solution

AI Generated Solution

Promotional Banner

Similar Questions

Explore conceptually related problems

The table shows the marks obtained by 25 students in a class test. Find the mean of the marks obtained

The average marks of 30 students are 45 but after checking , there are two mistakes found. After adjustment , if a student got 45 more marks and other student got 15 less marks , then what will be the adjusted average ?

Two students appeared for an examination. One student who scored 20 marks more than the other, his score was 60% of the sum of their marks. What was his score?

The mean marks obtained by 300 students in a subject are 60. The mean of top 100 students was found to be 80 and the mean of last 100 students was found to be 50. The mean marks of the remaining 100 students are

The average marks of 18 students in an examination was 60. It was later found that the marks of one student had been wrongly entered as 63 instead of 36. The correct average is:

The mean of the marks scored by 40 students was found to be 35. Later on it was discovered that a score of 43 was misread as 34. The correct mean is

In the given histogram, what is the mean marks of the students. correct to one decimal place?

In the given histogram, what is the mean marks of the students. correct to one decimal place?

The average marks of 42 students in an examination, was 64. Later it was found that the marks of three students were misread as 72, 58 and 44 instead of the actual marks 64, 42 and 26 respectively. What is the correct average marks?