A Sample of 500 People Aged 30 - 40 Years

A sample of 500 people aged 30 - 40 years old were interviewed to study the relationship between whether a person graduated from college or only high school and whether s/he changed jobs in the last 5 years.The results are found in the contingency table below.
Answers below have been rounded to two decimal places.
Which of the following is a marginal frequency in the above table?

A) 63
B) 128
C) 245
D) 500

Correct Answer:

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