Question

Class mark and class size of the class interval are 25 and 10 respectively then the class interval is_______.

Answer 1

Answer:

Class mark and class size of the class interval are 25 and 10 respectively then the class interval is (a) 20 - 30 (b) 30 - 40 (0) 40 - 50 (d) 50 - 60

Step-by-step explanation:

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Answer 2

Upper limit = u

Lower limit = l

$class \: size = u - l \\ 10 = u - l \\ 10 + l = u$

$class \: mark \: = \frac{u + l}{2} \\ 25 = \frac{u + l}{2} \\ 25 \times 2 = u + l \\ adding \: the \: value \: of \: u \\ 50 = 10 + l + l \\ 50 - 10 = 2 \times l \\ \frac{40}{2} = l$

$u = l + 10 \\ = 20 + 10 \\ = 30$

$class \: interval \: is \: 20 - 30$

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