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SSC MTS 6 Aug 2019 Shift 3 Paper
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© examsnet.com
Question : 38
Total: 100
Average of 50 numbers was calculated as 20 when three numbers 26, 36 and 64 were wrongly read as 31, 46 and 59 respectively. What is the correct average?
24.4
19.8
26.2
20.2
Validate
Solution:
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
© examsnet.com
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