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Statistics
Measures of Central Tendency
jee_main_2026_april_6_shift_2
Grade None

Question:

The mean of 4 observations is 15. If one observation 10 is added, find the new mean.
A. 12
B. 13
C. 14
D. 15

Step-by-Step Solution

Key Concept: Sum of observations = mean × n.
Step 1: Old sum = 15 × 4 = 60. Step 2: New sum = 60 + 10 = 70. Step 3: New mean = 70/5 = 14.
Correct Answer: C
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