What are the minimum, first quartile, median, third quartile, and maximum of the data set? As cars passed a checkpoint, the following speeds were clocked and recorded. Speed (mph): 55 62 61 54 68 72 59 61 70

Answer 1

first, sort the numbers:
54 55 59 61 61 62 68 70 72

The min,median,max should now be obvious.
Now divide into 4 equal groups to see the quartiles.