Question : The average of the marks of 17 students in an examination was calculated as 71. However, it was later found that the mark of one student had been wrongly entered as 65 instead of 56 and another as 24 instead of 50. The correct average is:
Option 1: 70
Option 2: 71
Option 3: 72
Option 4: 73
Latest: SSC CGL preparation tips to crack the exam
Don't Miss: SSC CGL complete guide
Correct Answer: 72
Solution :
Given:
Average of the marks of 17 students in an examination = 71
Wrong marks = 65 + 24 = 89
Correct marks = 56 + 50 = 106
Difference = 106 – 89 = 17 marks
$\therefore$This difference affect the 17 students $= \frac{17}{17} = 1$
And incorrect average = 71
$\therefore$ Correct average = 71 + 1=72
Hence, the correct answer is 72.
Related Questions
Know More about
Staff Selection Commission Combined Grad ...
Answer Key | Eligibility | Application | Selection Process | Preparation Tips | Result | Admit Card
Get Updates Brochure
Your Staff Selection Commission Combined Graduate Level Exam brochure has been successfully mailed to your registered email id “”.
