Given, $-\frac{3}{8}+\frac{1}{7}=+\Big(\frac{-3}{8}\Big)$
Let two rational number, $\text{a}=\frac{-3}{8},\ \text{b}=\frac{1}{7}$
$\therefore\text{a}+\text{b}=\frac{-3}{8}+\frac{1}{7}$
$=\frac{-21+8}{56}$
$=\frac{-13}{56}$
and
$\text{b}+\text{a}=\frac{1}{7}+\frac{-3}{8}$
$=\frac{8-21}{56}$
$=\frac{-13}{56}$
Clearly, $a + b = b + a$
So, addition is communucation for rational numbers.
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Number of students
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$250–300$
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$10$
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$300–350$
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$12$
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$350–400$
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$14$
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$400–450$
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$13$
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$450–500$
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$11$
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