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- Write average and count.
- Find total = average x count.
- Adjust total if values are added/removed/replaced.
Correct Answer: B
Correct Answer: B
Method / Topic: Average
The answer follows from total divided by number of values.
Short Explanation
Detailed Explanation
Correct Answer: B
Method / Topic: Average
<table cellspacing="0" style="border-collapse:collapse; width:85px">
<tbody>
<tr>
<td style="border-bottom:none; border-left:none; border-right:none; border-top:none; height:20px; vertical-align:top; white-space:normal; width:85px">Average means total divided by number of persons. Total weight of 8 students = 8×52 = 416 kg. When the teacher joins, new total = 416+74.5 = 490.5 kg. Now there are 9 persons. New average = 490.5/9 = 54.5 kg. So the
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Learn + Solve: Shortcut, Trap & Fast Route Click to view shortcut, steps, and common mistake
Shortcut used, common trap, and the fastest solving route
- Write average and count.
- Find total = average x count.
- Adjust total if values are added/removed/replaced.
The average weight of 8 students is 52 kg. If a teacher of weight 74.5 kg joins them, what is the new average weight?
Explanation
Correct Answer: B
Method / Topic: Average
The answer follows from total divided by number of values.
Short Explanation
Detailed Explanation
Correct Answer: B
Method / Topic: Average
<table cellspacing="0" style="border-collapse:collapse; width:85px">
<tbody>
<tr>
<td style="border-bottom:none; border-left:none; border-right:none; border-top:none; height:20px; vertical-align:top; white-space:normal; width:85px">Average means total divided by number of persons. Total weight of 8 students = 8×52 = 416 kg. When the teacher joins, new total = 416+74.5 = 490.5 kg. Now there are 9 persons. New average = 490.5/9 = 54.5 kg. So the
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