Measures of Cen...

A group of $$10$$ items has arithmetic mean $$6$$. If the arithmetic mean of $$4$$ of these items is $$7.5$$, then the mean of the remaining items is

Marks obtained by 60 students of a class are shown as 

The daily wages (in Rs.) of ten workers are $$20,25,17,18,8,15,22,11,9,14$$. The median of wages is

The number of observations in a group is $$40$$. If the average of first $$10$$ is $$4.5$$ and that of the remaining $$30$$ is $$3.5$$, then the average of the whole group is:

Obtain the median for the following frequency distribution

If $$x_i$$'s are the mid points of the class intervals of grouped data, $$f_1$$'s are the corresponding frequencies and $$\bar x$$ is the mean, then $$\sum (f_i x_i - \bar x)$$ is equal to

If $$u_i \displaystyle = \frac{x_i - 25}{10} , \sum f_i u_i=20$$ and $$\sum f_i =100$$, then $$\overline {x}$$ is equal to

A firm of readymade garments make both men's and women's shirt. Its profit average is $$6$$% of sales. Its profits in men's shirt average $$8$$% of sales and women's shirts comprise $$60$$% of output. The average profit per sales rupee in women's shirts is :

Following table gives frequency distribution of trees planted by different housing societies in a particular locality.
Find mean number of trees planted by housing society by using 'step deviation method'.

The results of two colleges are as follows: then