Find the mean of the following distribution: (Approximately)

X 20 22 25 26 31
F 20 25 25 30 35

This question was previously asked in
OSSC CGL 2022 Official Paper (Held on: 18th Oct Shift 1)
View all OSSC Combined Graduate Level Papers >
  1. 27.48
  2. 29.48
  3. 25.48
  4. 31.48

Answer (Detailed Solution Below)

Option 3 : 25.48
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Detailed Solution

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Formula used:

Mean = ∑ FX / ∑ F

Calculation:

∑ FX = (20 × 20) + (22 × 25) + (25 × 25) + (26 × 30) + (31 × 35)

∑ FX = 400 + 550 + 625 + 780 + 1085

∑ FX = 3440

∑ F = 20 + 25 + 25 + 30 + 35 = 135

Mean = 3440 / 135

Mean = 25.48

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