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A. None of these
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B. Subtract the leaving student’s marks from total sum, then divide by 4
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C. Add the leaving student’s marks to the total and divide by 4
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D. Multiply the original average by 4
Explanation
First, calculate the total sum: average × 5
Then subtract the marks of the student who left, and divide the result by 4 to get the new average.
Explanation
We are given:
Average of 6 numbers = 10
So, total sum = 10 × 6 = 60
If each number is multiplied by 3, then the new total becomes:
New total = 60 × 3 = 180
Number of values = still 6
New average = 180 ÷ 6 = 30
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A. 8.0
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B. 10.0
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C. 6.0
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D. 7.5
Explanation
We are given:
Now, one number (20) is removed:
So, new average = 30 ÷ 4 = 7.5
✅ Correct: 0 |
❌ Wrong: 0 |
📊 Total Attempted: 0
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