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Mean, Median and Mode · Question 35 of 67

Question 35

EasyOriginal question

A lab thermometer was found to read 2 °C too high. The mean of the 12 readings taken with it was 31.4 °C. What is the mean of the corrected readings?

Options for question 35

Show the answer and explanation
CorrectNot quiteAnswer B

Correct answer: B

Explanation

  1. Subtracting 2 from every reading subtracts 2 from the mean.

  2. Corrected mean = 31.4−2=29.431.4 - 2 = 29.4 °C.

Worth noting

33.4 °C adds the error instead of removing it. 7.4 °C subtracts the total error of all 12 readings (24 °C) from the mean instead of from the total.

Concept
Shifting every value shifts the mean by the same amount
Typical time
40 s
Your time
—
The rule this testsWhen values change
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