## Statistics Assignment for Class 9

Class 9 Statistics students should refer to the following printable assignment in Pdf in standard 9. This test paper with questions and answers for Grade 9 Statistics will be very useful for exams and help you to score good marks

### Class 9 Statistics Assignment Pdf

**Question : A survey conducted by an organisation for the cause of illness and death among the women between the ages 15 − 44 (in years) worldwide, found the following figures (in %):**

**(i) Represent the information given above graphically.**

**(ii) Which condition is the major cause of women’s ill health and death worldwide?**

**(iii) Try to find out, with the help of your teacher, any two factors which play a**

**major role**

**in the cause in (ii) above being the major cause.**

**Answer:**(i) By representing causes on x-axis and family fatality rate on y-axis and choosing an appropriate scale (1 unit = 5% for y axis), the graph of the information given above can be constructed as follows.

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

**(i) Represent the information above by a bar graph.**

**(ii) In the classroom discuss what conclusions can be arrived at from the graph.**

**Answer:**(i) By representing section (variable) on x-axis and number of girls per thousand boys on y-axis, the graph of the information given above can be constructed by choosing an appropriate scale (1 unit = 100 girls for y-axis)

**Question : Given below are the seats won by different political parties in the polling outcome of a state assembly elections:**

**(i) Draw a bar graph to represent the polling results.**

**(ii) Which political party won the maximum number of seats?**

**Answer:**(i) By taking polling results on x-axis and seats won as y-axis and choosing an appropriate scale (1 unit = 10 seats for y-axis), the required graph of the above information can be constructed as follows.

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

**Length (in mm) Number of leaves**

**118 − 126 3**

**127 − 135 5**

**136 − 144 9**

**145 − 153 12**

**154 − 162 5**

**163 − 171 4**

**172 − 180 2**

**(i) Draw a histogram to represent the given data.**

**(ii) Is there any other suitable graphical representation for the same data?**

**(iii) Is it correct to conclude that the maximum number of leaves are 153 mm long?**

**Why?**

**Answer:**(i) It can be observed that the length of leaves is represented in a discontinuous class interval having a difference of 1 in between them. Therefore,

^{1}/

_{2}= 0.5has to be added to each upper class limit and also have to subtract 0.5 from the lower class limits so as to make the class intervals continuous.

**Question : The following table gives the life times of neon lamps:**

**(i) Represent the given information with the help of a histogram.**

**(ii) How many lamps have a lifetime of more than 700 hours?**

**Answer:**(i) By taking life time (in hours) of neon lamps on x-axis and the number of lamps on y-axis, the histogram of the given information can be drawn as follows.

**Question : The following table gives the distribution of students of two sections according to the mark 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.**

**Answer:**We can find the class marks of the given class intervals by using the following formula.

**Question : The runs scored by two teams A and B on the first 60 balls in a cricket match are given below:**

**Represent the data of both the teams on the same graph by frequency polygons.**

**[Hint: First make the class intervals continuous.]**

**Answer:**It can be observed that the class intervals of the given data are not continuous.

**By taking class marks on x-axis and runs scored on y-axis, a frequency polygon can be constructed as follows.**

**Question : A random survey of the number of children of various age groups playing in park was found as follows:**

**Draw a histogram to represent the data above.**

**Answer:**Here, it can be observed that the data has class intervals of varying width. The proportion of children per 1 year interval can be calculated as follows.

Taking the age of children on x-axis and proportion of children per 1 year interval on y-axis, the histogram can be drawn as follows.

**Question : 100 surnames were randomly picked up from a local telephone directory and a frequency distribution of the number of letters in the English alphabet in the surnames was found as follows:**

**(i) Draw a histogram to depict the given information.**

**(ii) Write the class interval in which the maximum number of surname lie.**

**Answer:**(i) Here, it can be observed that the data has class intervals of varying width. The proportion of the number of surnames per 2 letters interval can be calculated as follows.

Question : Define array or arrayed data.

Question : Define frequency.

Question : Write the relation between class mark, lower limit and upper limit of a class interval.

Question : Define primary data.

Question : Define secondary data. How it is differ from the primary data?

Question : Find the mode of the following data :

** **

How many students are there whose marks are less than the modal value?

Question : Following data represents the favourite fruit liked by 20 children.

Make a frequency table to find how many more children chose apple as their favourite fruit than pomegranate.

Question : Make a bar graph of the given data

Question : Following frequency table represents the number of students in each section of class 9th of ABC school. Find the mean number of students per sections.

**Click on link below to download CBSE Class 9 Mathematics Statistics Assignment Set A**