For a sample of 7 people, their weight (kg) and walking speed (km/hour) were measured:

Weight 51 62 68 76 83 89 95

Speed 6.4 6.2 5.9 5.2 4.4 3.8 3.2 If a person weighs 70 kg, what would we expect their average walking speed to be? Round to 1 decimal.