Question

The mid value of a class interval is 25 and the class size is 8 .the class interval is

Answer 1

(8+1)/2 = 4.5

25-4.5 = 20.5

25+4.5= 29.5

therefore class interval is 20.5 - 29.5

Answer 2

The class interval is 21 - 29

Given :

The mid value of a class interval is 25 and the class size is 8

To find :

The class interval

Solution :

Step 1 of 3 :

Find upper class limit

Upper class limit

$\displaystyle \sf{ = Mid \: Value + \frac{Class \: Size}{2} }$

$\displaystyle \sf{ = 25 + \frac{8}{2} }$

$\displaystyle \sf{ = 25 + 4 }$

$\displaystyle \sf{ = 29 }$

Step 2 of 3 :

Find lower class limit

Lower class limit

$\displaystyle \sf{ = Mid \: Value - \frac{Class \: Size}{2} }$

$\displaystyle \sf{ = 25 - \frac{8}{2} }$

$\displaystyle \sf{ = 25 - 4}$

$\displaystyle \sf{ = 21}$

Step 3 of 3 :

Find the class interval

The class interval is 21 - 29

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