Answer:
something that is based on another soure
Step-by-step explanation:
Answer:
The fraction of the students that walk in in Marla's school is equal to 
Step-by-step explanation:
Let
x------> the total students in Marla's school
we know that
The number of students that not ride the bus is equal to

The number of students that walk to the school is equal to

therefore
The fraction of the students that walk in in Marla's school is equal to 
Answer:
0.02
Step-by-step explanation:
High schools A :
Percentage of participants in on the school athletic team = 20%
Pa = 20% = 0.2
High school B:
Percentage of participants in on the school athletic team = 18%
Pa = 18% = 0.18
The mean of sampling distributon is :
Pa - Pb
0.2 - 0.18
Hence, Mean of sampling distribution is 0.02