28%
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0.5 percent
66%
It can vary because students vary in size. Usually girls are smaller than boys but girls often mature sooner than boys and will have a rapid growth spurt than boys of the same age. There is the age difference as well. Some kids are younger by as much as 10-11 months because of when their birthday was. So there is no one size for 4th grade since no one is exactly the same as anyone else.
approxiately 33%
Decrease = 15 - 3 = 12 So %age decrease = 100*12/15 = 80%