Descriptive Sta...

If a variable $$X$$ takes values $$0,1,2,....,n$$ with frequencies $${ _{  }^{ n }{ C } }_{ 0 },{ _{  }^{ n }{ C } }_{ 1 },{ _{  }^{ n }{ C } }_{ 2 },......{ _{  }^{ n }{ C } }_{ n }\quad $$ respectively, then S.D. is equal to :

If a variable $$x$$ takes values $$0,1,2,....n$$ with frequencies proportional to the binomial coefficients $${ _{  }^{ n }{ C } }_{ 0 },{ _{  }^{ n }{ C } }_{ 1 },{ _{  }^{ n }{ C } }_{ 2 },......{ _{  }^{ n }{ C } }_{ n }$$, then mean of distribution is 

The quartile deviation for the data

The variance of the data:

How many less letters were collected on Wednesday than on Tuesday?

The S.D. of the following frequency distribution is 

The adjoining diagram illustrates the information collected about the number
of brothers of the boys in a certain group. What is the total number of boys in
this group?

The horizontal line in a bar graph is called:

The incomplete pictograph shows the number of stamps(1 ticket = 4 stamps) collected by four pupils:
The missing tickets represents the number of stamps collected by Anjali.