English

Is it correct to say that in a histogram, the area of each rectangle is proportional to the class size of the corresponding class interval? If not, correct the statement. - Mathematics

Advertisements
Advertisements

Question

Is it correct to say that in a histogram, the area of each rectangle is proportional to the class size of the corresponding class interval? If not, correct the statement.

Correct and Rewrite
Advertisements

Solution

As we know that in a histogram, the area of each rectangle is proportional to the corresponding frequency of its class.

Hence, the given statement is not correct.

shaalaa.com
  Is there an error in this question or solution?
Chapter 14: Statistics & Probability - Exercise 14.2 [Page 137]

APPEARS IN

NCERT Exemplar Mathematics [English] Class 9
Chapter 14 Statistics & Probability
Exercise 14.2 | Q 5. | Page 137

RELATED QUESTIONS

Read the bar graph shown in Fig. 23.10 and answer the following questions
(i) What is the information given by the bar graph?

(ii) What was the number of commercial banks in 1977?
(iii) What is the ratio of the number of commercial banks in 1969 to that in 1980?
(iv) State whether true or false:
The number of commercial banks in 1983 is less than double the number of commercial banks in 1969.

 


Given below (Fig. below) is the bar graph indicating the marks obtained out of 50 in mathematics paper by 100 students. Read the bar graph and answer the following questions:

(i) It is decided to distribute work books on mathematics to the students obtaining less than 20 marks, giving one workbook to each of such students. If a work book
costs Rs 5, what sum is required to buy the work books?
(ii) Every student belonging to the highest mark group is entitled to get a prize of Rs. 10. How much amount of money is required for distributing the prize money?
(iii) Every student belonging to the lowest mark—group has to solve 5 problems per day. How many problems, in all, will be solved by the students of this group per day?
(iv) State whether true or false.
a. 17% students have obtained marks ranging from 40 to 49.
b. 59 students have obtained marks ranging from 10 to 29.
(v) What is the number of students getting less than 20 marks?
(vi) What is the number of students getting more than 29 marks?
(vii) What is the number of students getting marks between 9 and 40?
(viii) What is the number of students belonging to the highest mark group?
(ix) What is the number of students obtaining more than 19 marks?


Read the bar graph given in Fig. 23.19 and answer the following questions:
(i) What information is given by the bar graph?

(ii) In which years the areas under the sugarcane crop were the maximum and the minimum?
(iii) State whether true or false:
The area under the sugarcane crop in the year 1982 - 83 is three times that of the year 1950 - 51


Read the following bar graph and answer the following questions:
(i) What information is given by the bar graph?
(ii) In which year the export is minimum?
(iii)In which year the import is maximum?
(iv)In which year the difference of the values of export and import is maximum?


The population of Delhi State in different census years is as given below:
 

Census year 1961 1971 1981 1991 2001
Population in Lakhs 30 55 70 110 150

The distribution of heights (in cm) of 96 children is given below. Construct a histogram and a frequency polygon on the same axes.

Height (in cm): 124
to
128
128
to
132
132
to
136
136
to
140
140
to
144
144
to
148
148
to
152
152
to
156
156
to
160
160
to
164
No. of Children: 5 8 17 24 16 12 6 4 3 1

The following is the distribution of total household expenditure (in Rs.) of manual worker in a city:

Expenditure
(in Rs):
100-150 150-200 200-250 250-300 300-350 350-400 400-450 450-500
No. of manual workers: 25 40 33 28 30 22 16 8

Draw a histogram and a frequency polygon representing the above data.


A frequency polygon is constructed by plotting frequency of the class interval and the


For the following table, draw a bar-graph

A C D E F
230 400 350 200 380 160

The following table shows the market position of different brands of tea-leaves.

Brand A B C D others
% of Buyers 35 20 20 15 10

Draw it-pie-chart to represent the above information.


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×