The average of 9 numbers is 3. If the average of the first 8 of these numbers is 2,

The average of 9 numbers is 3. If the average of the first 8 of these numbers is 2, the 9th number is:
9 संख्याओं का औसत 3 है। यदि इनमें से प्रथम 8 संख्याओं का औसत 2 है, तो 9वीं संख्याज्ञात कीजिए?

12 14 15 11

Detailed Solution & Logic

Correct Answer:

11

Average of 9 numbers = 3
Total of 9 numbers = $ 9 \times 3 = 27 $
Average of first 8 numbers = 2
Total of first 8 numbers = $ 8 \times 2 = 16 $
9th number = 27 - 16 = 11
Answer = 11

← Previous Question Next Question →