The answer is D) because C) and B) are biased and would not be reasonable and A) has no guarantee of every third child being 12.
Another word for median is middle. The median is the middle number of a list of numbers.
Answer:
There are 5 black counters in the bag.
Step-by-step explanation:
15 green counters in the bag
The proportion of green counters is given by:

So, we have that, the total is x. So


There are 30 total counters.
How many black counters are in the bag ?
A sixth of the counters are black. So

There are 5 black counters in the bag.