There are 23 percuionit are on the ideline.
Given that in the high school band there are 2 percuionit on the ideline to every 13 marching instrument.
We have to find the percuionit are on the ideline when the high school band has 150 total member.
Firstly, we will find the scale factor by dividing the number of percuionit on the ideline to the every marching instrument.
According to the given question, the scale factor = number of percuionit on the ideline / the every marching instrument
Scale factor=2/13
Now for 150 members number of percussionists is
(2/13)×150=23.07 or 23
Hence, the number of percussionists on the ideline is 23 when the high school band has 150 total member.
Learn more about the number of percussionists from here brainly.com/question/13652375
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