Math, asked by kedoaier, 9 months ago

class mark of (30-40) and (60-70) are​

Answers

Answered by mysticd
9

 i) Given \:class \: interval \: ( 30 - 40 )

 Lower \: boundary \: of \:the \:class = 30

 Upper \: boundary \: of \:the \:class = 40

 \red{ Class \: mark \: of \: 30 - 40 }

 = \green { Average \: of \: upper \: and }

 \green { lower \: boundaries }

 = \frac{ 30 + 40 }{2}

 = \frac{70}{2}

 \green { = 35}

 \therefore \red{ Class \: mark \: of \: 30 - 40 }  \green { = 35}

 ii) Given \:class \: interval \: ( 60 - 70 )

 Lower \: boundary \: of \:the \:class = 60

 Upper \: boundary \: of \:the \:class = 70

 \red{ Class \: mark \: of \: 60 - 70 }

 = \green { Average \: of \: upper \: and }

 \green { lower \: boundaries }

 = \frac{ 60 + 70 }{2}

 = \frac{130}{2}

 \green { = 65}

 \therefore \red{ Class \: mark \: of \: 60 - 70 }  \green { = 65}

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