Answer:
Rahm: 0.8
Bain: 1.2
Step-by-step explanation:
For this, they ask for the rate of change or slope. To find slope you can use slope formula to get your slope/rate of change.
Steps for Rahm:
We can take points (10,8) and (20,16) and find the slope with the following formula: 

This is the rate of change for Rahm
Steps for Bain:
Take the points (5,6) and (11,13.2) and plug them into the Slope Formula:

Therefore, Bain hiked faster than Rahm for he had the higher rate of change compared to Rahm.
It would be 5.53 because the 1 after the 3 is smaller than 5.
Answer: 4.75%.
Step-by-step explanation:
Given: The mean weight
of 500 college students is 70 kg and the standard deviation
is 3 kg.
Let X be the number of students weight over 75 kg.
If the weight is normally distributed, then the probability that students weigh over 75 kg:

Hence, the percentage of students weigh over 75 kg = 4.75%.