Identify and compile a list of the top 10 marketing research companies worldwide.

Explanation:

According to my research on market research companies, I can say that based on the information provided within the question the top 10 marketing research companies worldwide are the following:

These are the top 10 in the world in order by yearly revenue, with Nielsen leading with a yearly revenue of roughly $6.3 billion and Dunnhumby at position #10 with $429 million.

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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 !