Larry recorded his time as he ran. What was his average speed from hour 2 to hour 4? 6.75 mph 7 mph 13.45 14 mph What was his average speed from hour 4 to hour 7? 5 mph 7 mph 9.7 mph 21 mph Did he speed up or slow down? speed up slowed down stayed the same time elapsed(hr) distance run (mi) 2 13.5 4 27.5 7 48.5

1. 7mph;

2. 7mph

3. Stayed thesame

Step-by-step explanation:

Average speed = Distance/Time

1. What was his average speed from hour 2 to hour 4?

Speed = Distance/Time

Speed = (27.5 - 13.5)/(4 - 2)

Speed = (14/2)

Speed = 7mph

2. What was his average speed from hour 4 to hour 7?

Speed = Distance/Time

Speed = (48.5 - 27.5)/(7-4)

Speed = (21/3)

Speed = 7mph

3. Since the speed are thesame, he stayed thesame.

answer: .64

step-by-step explanation

set up the formula for standard deviation for this set of numbers, then simplify