Question : The average marks of 17 students in an examination was calculated as 71. However, it was later found that one student's mark 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
New: SSC CHSL Tier 2 answer key released | SSC CHSL 2024 Notification PDF
Recommended: How to crack SSC CHSL | SSC CHSL exam guide
Don't Miss: Month-wise Current Affairs | Upcoming government exams
New: Unlock 10% OFF on PTE Academic. Use Code: 'C360SPL10'
Correct Answer: 72
Solution : The total sum of marks was initially = 71 × 17 = 1207 The wrongly entered marks are 65 and 24, so subtract these from the total = 1207 – 65 – 24 = 1118 The correct marks are 56 and 50, so add these to the total = 1118 + 56 + 50 = 1224 Correct average = $\frac{\text{Total correct sum}}{{\text{Number of students}}}=\frac{1224}{17} = 72$ Hence, the correct answer is 72.
Candidates can download this e-book to give a boost to thier preparation.
Result | Eligibility | Application | Admit Card | Answer Key | Preparation Tips | Cutoff
Question : The average of 100 observations was calculated as 35. It was found later, that one of the observations was misread as 83 instead of 53. The correct average is:
Question : The average of 16 numbers is 35. It was found later that four numbers 18, 17, 24, and 35 were taken by mistake. What is the new average after removing these numbers?
Question : The average age of 24 students is 12 years. It was observed that while calculating the average age, the age of a student was taken as 14 years instead of 8 years. What will be the correct average age (in years)?
Question : Directions: Joel and Tom were travelling from town X to town Y which was 210 km apart. Joel set off 1 hour and 15 minutes later than Tom but arrived 15 minutes earlier. If the average speed of Tom was 42 km/h, find the average speed of Joel.
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile