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I would expect a mild negative correlation. Girls tend to have smaller feet and so smaller shoe sizes and they tend t o score better at school.
pearson correlation
Negative
correlation equals 16% thus r squared (r^2) = 0.16 thus r = 0.4 or 40%
Do you mean what grade in school a child is in? If that's what you mean, then no, grade level doesn't affect heart rate, but there is probably a correlation between a child's age -- which is closely associated with his grade level -- and his heart rate.
Studying
A C grade is a satisfactory achievement in the course you are studying.
I have a cousin in Illinois who is studying algebra in seventh grade
Depends what you are studying.
By studying harder for the next semester.
yes, if you fail the grade you are currently studying in badly, then most likely, you will repeat that particular grade.
Maths grade should be the full mark.It is a must of Maths