The sum of the class marks of the classes 90-120 and 120-150 is: 

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NTPC CBT-I (Held On: 5 Jan 2021 Shift 2)
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  1. 210
  2. 170
  3. 220
  4. 240

Answer (Detailed Solution Below)

Option 4 : 240
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Detailed Solution

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Formula used:

Class marks = (Lower limit + Upper limit)/2 

Calculation:

The sum of the class marks of 90-120 and 120-150 = (90 + 120)/2 + (120 + 150)/2 

⇒ 210/2 + 270/2 = 105 + 135 = 240

∴ The required result = 240 

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