Question Bank • QB_GA_087 NAT • 2 Marks

Section 8: General Aptitude

Quantitative Aptitude

Subtopic: Data Interpretation

Question Statement:

The average marks of 40 students in a class was calculated as 68. Later, it was discovered that one student's marks were wrongly entered as 85 instead of the correct value 45. Calculate the true corrected average of the class.

Answer Key:

67

Step-by-Step Solution & Explanation

Initial total sum of marks: $S = 40 \times 68 = 2720$ Corrected total: $S_{\text{correct}} = 2720 - 85 + 45 = 2720 - 40 = 2680$ Corrected average: $\text{Average} = \frac{2680}{40} = 67.0$
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