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I need to solve this: Isobel’s class of 13 pupils all received an average of 85% on their history exam collectively. William scored 100%. If William is removed from the collective results, what would the new average be? My solution is: totalScore / 13 = 85 totalScore = 85*13 = 1105 I subtract William's score 100 from 1105 and divide it by 12 to get new average. (totalScore - 100) / 12 = newAverage (1105 - 100) / 12 = 1005 / 12 = 83.75 New average is 83.75%. Is this correct?

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RainMan said: Maybe they want you to doubt yourself, deliberately put the wrong answer so that they see if you will stand up for yourself. Click to expand... Who knows! Maybe it's worth sending them an email.
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Maybe they want you to doubt yourself, deliberately put the wrong answer so that they see if you will stand up for yourself.
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Debsta said: This is a bit disturbing. Here is an extract from the Air Traffic Control Practice Test linked in Post#3. It is incorrect, isn't it? View attachment 44590 Click to expand... Yes, incorrect. Ironic for a numerical reasoning sample test question.
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This is a bit disturbing. Here is an extract from the Air Traffic Control Practice Test linked in Post#3. It is incorrect, isn't it?
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If you have written the question correctly, then yes they are wrong.
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Well, the official answer is 84.1%. Are they wrong? You can look at Air Traffic Control Tests: Free Practice Test and Study Guide Taking an air traffic control test? Read more on the test format, the different sections & how to prepare effectively with our free practice questions & study guide.   Question is from Air Traffic Controller exam.
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Correct! Well done!
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