If the mean of 26 observations is 29, and on adding four more observations,…
2025
If the mean of 26 observations is 29, and on adding four more observations, the new mean becomes 32. What is the mean of the last four observations?
- A.
50
- B.
51.5
- C.
23.54
- D.
55.6
Attempted by 29 students.
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Correct answer: B
Solution:
Compute the sum of the first 26 observations: 26 × 29 = 754.
Compute the total after adding four observations (30 observations total): 30 × 32 = 960.
Find the sum of the four new observations: 960 − 754 = 206.
Compute the mean of the four observations: 206 ÷ 4 = 51.5.
Final answer: 51.5