The student body at a high school was surveyed about sports participation. the table below shows the data by grade level.
the number of students who are in 9th grade and play two or more sports is a
'marginal frequency'
'joint frequency'
the number of students who are in the 11th grade is a
'marginal frequency'
'joint frequency'
the percentage of the student body that plays one sport is a
'marginal relative frequency'
'joint relative frequency'
the percentage of the student body that are in 12th grade and do not play a sport is a
'marginal relative frequency'
'joint relative frequency'

Marginal frequency:

The number in the end column or row - "Total".

Joint frequency:

The ratio of the frequency in a particular category and the total number of data values.

Basically, the values that aren't in the final row or column - "Total".

The number of students who are in 9th grade and play two or more sports is a  joint frequency.

This is only asking for the students in 9th grade who play two or more sports.

The number of students who are in the 11th grade is a  marginal frequency.

This is asking for the total number of students in 11th grade.

The percentage of the student body that plays one sport is a  marginal relative frequency'.

This is asking for the total number of students who play 1 sport.

The percentage of the student body that are in 12th grade and do not play a sport is a  joint relative frequency.

This is only asking for the students in 12th grade and don't play sports.

wait this depends wether emily and zach how they are thinking.

yes they are the same.