Answer:
The amount of calories Lucie will burn by jumping for 1 minute is 8 calories
Explanation:
The given data values are;
Minutes 
 Calories Burned
 Calories Burned
40 
 320
 320
80 
 640
 640
120 
 960
 960
160 
 1280
 1280
The value of calories burnt and the number of minutes of jump robe are seen to be directly proportional, such that we have;
40 minutes of jump rope will yield 320 calories burnt 
Therefore we have;
1 minute of jump rope will yield 320/40 = 8 calories burnt
The amount of calories Lucie will burn by jumping for 1 minute = 8 calories.