Question : The mean of five numbers is 45. If a sixth number is also included, the mean becomes 48. Find the sixth number.
Option 1: 73
Option 2: 63
Option 3: 43
Option 4: 53
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Correct Answer: 63
Solution : The mean or average of five numbers = 45 Sum of the five numbers = 5 × 45 = 225 When the sixth number is also included, the mean becomes 48. Sum of the six numbers = 6 × 48 = 288 The sixth number = 288 – 225 = 63 Hence, the correct answer is 63.
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