Statistics is branch of

When the information is gathered from a source which already had the information stored, the data obtained is called

Class mark = 

In the distribution, the frequency of the class 0 - 5 is
0,3,2,5,8,10,13,5,6,6,14,0.

The width of the class interval 70.5 - 75.5 is

In a specific year, the distribution of the ages (in years) of primary teachers of a district is given:

(i) What is the lower limit of the first class interval?
(ii) What are the limits of the fourth class interval?
(iii) What is the class mark of the class 45-50?

The blood group of 30 students are recorded as follows:

Prepare a freqeuncy distribution table for the data.

A family with monthly income of Rs 20,000 had planned the following expenditures per month under various heads:

Draw a graph for the data above.

Find the median of the following data 15,28,72,56,44,32,31,43 and 51. If 32 is replaced by 23, find the new median.

10 numbers 8,11,15,19,x+1,2x-13,28,31,40,41 are written in ascending order. If the median is 24, find x.

The following data on the number of girls (to the nearest ten) per thousand boys in different sections of the Indian society is given below:

(i) Represent the information above by a bar graph.
(ii) In the classroom discuss what conclusion can be arrived at from the graph.

The length of 40 leaves of a plant are measured a correct one millimeter, and the obtained data is represented in the following table:

(i) Draw a histogram to represent the given data.
(ii) Is there any suitable graphical representation for the same data?
(iii) Is it correct to conclude that the maximum number of leaves are 153 mm long? Why?

The following table gives the distribution of students of two sections according to the marks obtained by them:

Represent the marks of the students of both the sections on the same graph by two frequency polygons. From the two polygons compare the performance of the two sections.

In a Mathematics test given to 15 students, the following marks (out of 100) are recorded:
41,39,48,52,46,62,54,40,96, 52,98,40,42,52,60
Find the mean, median and mode of this data.

Find the mode of 14,25,14,28,18,17,18,14,23,22,14,18

The following data gives the number (in thousands) of applicants registered with an Employment Exchange during 2005-2010.

Construct a bar graph to represent the above data.

Draw a histogram representing the following frequency distribution:

The runs scored by two teams A and B on the first 42 balls in a cricket match are given below. Draw the frequency polygon on the same graph paper.

Survey on the playing children of various age group is:

Draw the histogram of above data

The % of marks obtained by students in the annual examination of a class in mathematics are given below:

(i) How many students get less than 30% of marks?
(ii) Represent the data by histogram.
(iii) Which value is depicted by a student Ram obtaining the highest marks in the interval 45-50?