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Mean, Median and Mode · Question 39 of 67

Question 39

EasyOriginal question

The mean noon temperature in Chennai over a week was 25 °C. What is this mean in degrees Fahrenheit? (Use F=95C+32F = \frac{9}{5}C + 32.)

Options for question 39

Show the answer and explanation
CorrectNot quiteAnswer C

Correct answer: C

Explanation

  1. Every reading is converted by the same rule F=95C+32F = \frac{9}{5}C + 32, so the mean is converted the same way.

  2. Mean = 95×25+32=45+32=77\frac{9}{5} \times 25 + 32 = 45 + 32 = 77 °F.

Worth noting

45 °F forgets the + 32, and 57 °F forgets to multiply by 9/59/5. 102.6 °F adds 32 before multiplying.

Concept
The mean follows a linear change applied to every value
Typical time
40 s
Your time
—
The rule this testsWhen values change
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