Can you please explain Test 7 section 4 question #22 ?

Sure. To find the median value of the 7 states you’re given, first place the numbers in order:

19.5%, 21.9%, 25.9%, 27.9%, 30.1%, 36.4%, 35.5%

Because there are 7 items in the list (an odd number), the median is just the middle number once they’re listed in order. In this case, that’s 27.9%.

The median for all 50 states, the question tells us, is 26.95%.

The question asks us for the difference between the median for the 7 states we’re given (we just calculated that to be 27.9%) and the median for all 50 states (the question gives this to us, 26.95%).

27.9% – 26.95% = 0.95%