Average of 12 numbers 1270. If average of 8 is 1265, average of remaining 4? MCQ with Answer and Explanation

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Average of 12 numbers 1270. If average of 8 is 1265, average of remaining 4?

A. 1282

B. 1278

C. 1275

D. 1280

Answer: Option D

Solution (By JKSSB Mock Tests)

Sum12=15240. Sum8=10120. Remaining=5120. Average=1280.

This question belongs to: Maths Average

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Question #1

Average of 15 numbers 1310. If average of 9 is 1305, average of remaining 6?

A. 1315

B. 1317.5

C. 1320

D. 1318

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Correct Answer: Option B

Explanation:
Sum15=19650. Sum9=11745. Remaining=7905. Average=1317.5.

This question belongs to: Maths Average

Question #2

Average of 10 numbers 1580. If average of 6 is 1575, average of remaining 4?

A. 1590

B. 1587.5

C. 1586

D. 1585

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Correct Answer: Option B

Explanation:
Sum10=15800. Sum6=9450. Remaining=6350. Average=1587.5.

This question belongs to: Maths Average

Question #3

The average marks of 25 students is 70. If the marks of one student were misread as 80 instead of 60, find the correct average.

A. 70.0

B. 69.8

C. 69.2

D. 68.8

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Correct Answer: Option C

Explanation:
Total sum misread =25×70=1750. Correct sum =1750 -80 +60 =1730. Correct average =1730/25=69.2.

This question belongs to: Maths Average

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