Answer :
The percentage of high school seniors and eighth grade students is the 40% and the 15%.
According to the statement
we have to find that the percentage of high school seniors and eighth grade students.
For this purpose, we know that the
The percentage is a ratio expressed as a fraction of 100.
And with the given information,
the percentage is the used by the marijuana in the past year.
By the researchers,
the percentage of high school seniors in 2011 is 40%
And
the percentage of eighth grade students is 15%.
So, The percentage of high school seniors and eighth grade students is the 40% and the 15%.
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