Question

Find the lower boundaries and upper boundaries of the classes for the following consecutive class marks $0.34,0.54$ .

Answer 1

Class Size $=$ Difference between consecutive class marks $=0.54-0.34$

$\Rightarrow$ Class Size $=0.20$

Therefore,

$1^{st}$ interval-

Lower Boundary $=0.34-\frac{0.20}{2}=0.24$

Upper Boundary $=0.34+\frac{0.20}{2}=0.44$

$2^{nd}$ interval-

Lower Boundary $=0.54-\frac{0.20}{2}=0.44$

Upper Boundary $=0.54+\frac{0.20}{2}=0.64$