Question

A. A survey of 110 teachers showed that 28 of them have a second job.

Answer 1

Answer:

Correct option is:

D) B and C

Step-by-step explanation:

A. A survey of 110 teachers showed that 28 of them have a second job.  

B. A survey of 90 teachers showed that 27 of them have a second job.  

C. A survey of 70 teachers showed that 21 of them have a second job.  

D. A survey of 80 teachers showed that 32 of them have a second job.

Percentage of teachers having second job is calculated by the formula:

      $\dfrac{Teachers having second job}{Total number of teachers}\times 100$

So, percentage of second job teachers of survey A,B,C and D is:

                      A                  B          C           D

Percentage    25.45%       30%      30%      40%

Hence, two surveys that are proportional are

B and C

Hence, Correct option is:

D) B and C

Answer 2

The answer is D. B and C are proportional.