Question

what are the class size and the class mark of the class interval 45-50

Answer 1

$Given \:class \:interval \: 45 - 50$

$Lower \: boundary = 45$

$Upper \: boundary = 50$

$\red{ Class \:size }$

$\blue { = Upper \: boundary-Lower \: boundary}$

$= 50 - 45$

$\green{= 5}$

$\red{ Class \:mark}$

$\blue { = Average \: of \: upper \: and \: lower}$

$\blue { boundaries\:of \:that \:class }$

$= \frac{ 45 + 50}{2}$

$= \frac{95}{2}$

$\green { = 47.5}$

Therefore.,

$\red{ Class \:size\: of \: 45 - 50 } \green { = 5}$

$\red{ Class \:mark \: of \: 45 - 50}\green { = 47.5}$

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