GCE Mathematics 2022 Objective — Question 33
Question 33 of 50 from the General Certificate of Education (GCE) Mathematics 2022 Objective paper, with the correct answer and a full explanation.
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The mean of a set of 10 numbers is 56. If the mean of the first nine numbers is 55, find the 10th number.
- A. 75
- B. 65Correct
- C. 55
- D. 45
Explanation
Sum of first nine numbers = 55 x 9 = 495. Sum of all ten = 56 x 10 = 560. 10th number = 560-495 = 65.
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