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Arithmetic Mean

A survey with...

Question

A survey with 20 students is taken.

Find the number of students who prefer course books from Friend P's survey, if there are a total of 900 students in a school.

A

270

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B

360

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C

400

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D

250

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Solution

The correct option is B 360
The survey is taken with 20 students.

The number of students who chose course book in Friend P's survey is 8.

The necessary proportion = $\frac{8}{20}$

The number of students who prefer course book

= $\frac{8}{20}$ $\times$ 900

= 360

Hence, the number of students who prefer course book = 360

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