As cars passed a checkpoint, the following speeds were clocked and recorded.
Speed (mph): 55 62 61 54 68 72 59 61 70

15. Find the mean and the range of the data set. Show your work.

Question

As cars passed a checkpoint, the following speeds were clocked and recorded. 
Speed (mph):   55 62 61 54 68 72 59 61 70

15.  Find the mean and the range of the data set. Show your work.

anonymous · Answer

To find the range, find the largest and smallest numbers of the data set.  What are they?

anonymous · Answer

largest 72 70 68 62
smallest 54 55 59 61

anonymous · Answer

Oh, just the largest number and the smallest number.  72 and 54.  Now you just subtract them, and that's the range.

anonymous · Answer

range 18

anonymous · Answer

Yes :)

Now for the mean.  There are 8 numbers.  
Step 1:  You add all the numbers together
Step 2:  Divide by how many numbers there are (8).

Whatever number you come up with is the mean, or the average.

anonymous · Answer

62.4

anonymous · Answer

Wait, there are 9 numbers up there.

anonymous · Answer

You're right :D