SSC MTS 6 Aug 2019 Shift 3 Paper

Average of 50 numbers = 20
⇒ Sum of 50 numbers = 50 × 20 = 1000
⇒ Right numbers = 26 + 36 + 64 = 126
⇒ Wrong numbers = 31 + 46 + 59 = 136
⇒ Difference = 126 – 136 = 10
⇒ Now the correct sum of 50 numbers = 1000 – 10 = 990
⇒ Correct average of 50 numbers = 990/50 = 19.8
∴ The correct average is 19.8