For each year of his 9-year career, Brent recorded the fastest time he ran the 400-meter sprint, as shown in the

stemplot.

400-meter Times

What is the mean and how can it be interpreted?

The mean is u = 52.4. Over the last 9 years, Brent's

average time was 52.4 seconds.

The mean is u = 52. Over the last 9 years, Brent's

average time was 52 seconds.

The mean is 7 = 52.4. Over the last 9 years, Brent's

average time was 52.4 seconds.

The mean is = 52. Over the last 9 years, Brent's

average time was 52 seconds.

4

7 9

5 0 1 2 2 4 6

CO

1

Key: 5|4 = 54 seconds