Charlie works for a moving company. He can easily tell the difference in weight between two small boxes but cannot detect any difference at all between the weight of the washing machine and the weight of the dryer. This is an example of .

Weber's Law

Explanation:

Weber's law states that alteration or difference occurring in stimulus that can be fairly noticeable defines constant ratio of the actual stimulus. It is used field of quantitative psychology.

According to the question,Weber law is being displayed when Charlie has the capability to detect small boxes weight difference sufficiently as just-noticeable but  is not able to identify the weight of washing machine and dryer as it is not noticed by him in general way .

the median of the data is 4.

step-by-step explanation:

the median means the middle number of a given number.

to decide which one is the median, arrange in ascending or descending order. but sometimes, you may find two(2) number in the middle, but it's easy, just add them together and divide by 2.

so,   determine the median of the data. 2, 3, 3, 4, 5, 7, 9

it is already arranged, count 3 times forward and 3 backward and the one left is your answer.

2,3,3,4,5,7,9

our answer is 4.

hope this !

the right answer is a