Answer:


Step-by-step explanation:
Given


Solving (a): The mean
The mean of a uniform distribution is:

This gives:



Solving (b): The standard deviation
The standard deviation is:

This gives:





I'm thinking you would have to add the probabilities that you choose a boy with you choose someone in the science club minus a boy in the science club. You can't count these people twice.
I'm getting 59%
(11+10-2)/32
Answer: 75%
Step-by-step explanation:
35% of 5 liters is 1.75 liters
1.75 liters + 8 liters = 9.75 liters (only juice)
(5 liters + 8 liters = 13 liters) (the whole thing)
So, 9.75/13 is 75%
Answer: 6.7
Have a good day :D