ESAT Maths 1 · free worked solution
ESAT Maths 1 combined mean: compare totals
Mean solution: turn each mean into a total, subtract the first group, and get 20.
Answer first
Option EThe correct answer is
A mean hides a total; multiply each mean by its group size before comparing the groups.
This is original UniGenius practice material from the reviewed Maths 1 bank. It is not an official UAT-UK question, past paper, or recalled question.
The question
Read the setup, then choose the shortest valid route
The mean of readings is . The mean of the first readings is . What is the mean of the remaining readings?
Worked solution
The route in 4 steps
The total of all readings is .
The total of the first readings is .
The remaining readings have total .
Their mean is .
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