Hello!
To do this you see how many times 5 goes into 7. As you can see it only goes in once. This gives us a whole number one. Since we took away 5 we have two sevens left. This gives us the mixed number below.

I hope this helps!
Answer:
Among the given samples the sample which constitute a biased sample is given by, the sample obtained by,
'Surveying randomly among seventh grade girls of a school to determine what theme the whole school would prefer for the dance.'
Step-by-step explanation:
Among the given samples the sample which constitute a biased sample is given by, the sample obtained by,
'Surveying randomly among seventh grade girls of a school to determine what theme the whole school would prefer for the dance.' since the choices of those seventh grade girls in the sample may not reflect those of the whole school.