Answer:
520 out of 800 students ride the bus
Step-by-step explanation:
Given


Required
Determine the number of students 
To do this, we simply multiply the proportion by the total number of students.
i.e.


Express the percentage as decimal


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Answer:
$21
Step-by-step explanation:
40% of 15 is 6, and 15 + 6 is 21
Answer:
B. H1= b1=0
Step-by-step explanation:
the alternative hypothesis is correct