The mean of five numbers is 45. If a sixth number is also included, the mean becomes 48. Find the sixth number.
Answer & explanation
Correct answer: option 2
Sum of all 5 numbers = 5 × 45 = 225
After adding new number , Sum of all 6 numbers = 6 ×48 = 288
New 6th number = 288 - 225 = 63