The graph shows the time, t, it took a runner to run different distances, d. time (seconds)
10
9
8
7
6
5
4.
3
2
1
3 6
9 12 15 18 21 24 27 30
distance (meters)
1. How long did it take the runner to run 9 meters?
seconds
2. How far did the runner go in 6 seconds?
meters

The birth weights of newborn babies in the unites states follow in a normal distrubution with a mean of 3.4 kg and standard deviation of 0.6 kg. reaserches interested in studying how. children gain weights decide to take random samples of 100 newborn babies and calculate the sample mean birth weights for each sample