Question

# Find the mean using step deviation method.

A
14
B
13
C
12
D
10

Solution

## The correct option is D $$10$$ x Mid-point (frequency) $${ d }_{ i }={ x }_{ i }-6$$  $${ u }_{ i }=\cfrac { { x }_{ i }-6 }{ 4 }$$ $${ f }_{ i }{ u }_{ i }$$  0-4 2 1 -4 -1 -1 4-8 6 (a) 2 0 0 0 8-12 10 3 4 1 3 12-16 14 4 8 2 8     10     $$\sum { { f }_{ i }{ u }_{ i } } =10$$=10 Mean $$=a+\cfrac { \sum { { f }_{ i }u_{ i } } }{ \sum { { f }_{ i } } } \times h\\ =6+\cfrac { 10 }{ 10 } \times 4\\ =10\quad Ans$$Mathematics

Suggest Corrections

0

Similar questions
View More

People also searched for
View More