What was a major purpose of the federal Social Security system? A to support the visual arts by offering grants to young painters
and sculptors
B to maintain a standing army during times of peace
to create jobs maintaining national parks and infrastructure
D
to provide a pension system to support workers during their
retirement

D. To provide a pension system to support workers during their

retirement.

Explanation:

The Social Security system was founded by the Social Security Act, signed by President Franklin D. Roosevelt in 1935 as part of the New Deal. The general idea was to provide federal aid for elderly, unemployed, and disadvantaged people. However, the main purpose was to provide monetary compensations to retirees over sixty-five years according to their previous tax payments.

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 !