A testable question would be how much will a plant grow in the dark?
Or
How much bacteria is on a daily house hold item?

A hypothesis would be if I grow bacteria on a nutrient agar plate then the most amount of growth will show up on the garbage disposable.
If I put a plant in a dark room, then it will grow less than if it were in a light room.

Range: Take the lowest amount. In a data set and the highest amount in the data set and subtract the lowest from the highest.

Median: set all the data in order from least to greatest the find the middle

Mean: add all the data together and divide them by the amount you added.

Mode: find the most occurring number in the set of the data.