The average marks of 50 students in a class was found to be 64 . If the marks of two students were incorrectly entered as 38 and 42 instead of 83 and 24 , respectively, then what is the correct average?

If the average marks of two batches of 55 and 45 students respectively is 50 and 60, then the average marks of all the students is:a.54.5b.55c.56.8d.53

Emily, a teacher, was calculating the test scores of her class, which consisted of 50 students. Initially, she calculated the class average to be 75. However, upon inspection, she discovered that scores 90 and 65 were mistakenly noted as 80 and 60. What is the correct class average (up to one decimal place) after rectifying these mistakes?

The average mark obtained by 40 students is 56. If the average marks of 8 students who failed the examination are 10, what are the average marks of students who passed the examination?

The mean of the marks scored by 50 students was found to be 39. Later it was found that a score of 43 was written as 23. Find the correct mean.

In a class of 40 students, the mean score of the girls is 30, the mean score of the boys is 40, and the mean score of the entire class is 32. If the score of one boy was incorrectly computed as 30 for 40, what is the correct mean score for the entire class?22 Mark For ReviewA) 31B) 31.50C) 32.25D) 36