Question

Write the class size and the class mark of th class 55-75​

Answer 1

Class Size :

Upper limit - Lower limit

75 - 55

= 20

Class Mark :

Upper limit + Lower Limit / 2

55 + 75 / 2

130 / 2

= 65

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Answer 2

class size=

$= 75 - 55 \\ = 20$

$= \frac{75 + 55}{2 } \\ = \frac{130}{2} \\ = 65$

class mark=65

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