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Answer 1

$\large \boxed{{\boxed{ \underline{ \underline \blue{ \sf{answer : }}}}}}$

$\purple{ \sf{(c) \: 14 - 16 }} \\ \\ \green{\sf{class \: mark = \frac{lower \: limit + upper \: limit}{2} }} \\ \\ \pink{ \sf{class \: mark = \frac{14 + 16}{2} }} \\ \\ \pink{ \sf{class \: mark = \frac{30}{2} }} \\ \\ \pink{ \sf{class \: mark = \frac{ \cancel{30}}{ \cancel2} }} \\ \\ \boxed{\pink{ \sf{class \: mark = 15}}}$