Correct Answer: Option A

Explanation

The student calculated the mean as 45.3 for 5 numbers.

Therefore, the **wrong total (sum) he used was:  
   45.3 × 5 = 226.5

He discovered that his total was short by 20.5.  
   This means the actual (correct) sum is:  
   226.5 + 20.5 = 247

Correct mean = Correct sum ÷ Number of numbers  
   247 ÷ 5 = 49.4

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