# NCERT Solutions for Class 6 Maths Chapter 9 Exercise 9.4

NCERT Solutions for Class 6 Maths Chapter 9 Exercise 9.4 (Ex. 9.4) Data Handling free to download in PDF file or use online without downloading it. All the contents are free to use without any login or password.

Class 6 math solutions are updated for new academic session 2020-2021 with PDF and videos solutions. Questions are done by subject experts in easy to understand methods. Call us for help, if you are facing any problem using these contents.## Class 6 Maths Chapter 9 Exercise 9.4 Solution

Class: 6 | Mathematics |

Chapter: 9 | Data Handling |

Exercise: 9.4 | NCERT Books Solutions |

### CBSE NCERT Class 6 Maths Chapter 9 Exercise 9.4 Solution in Hindi and English Medium

### Class 6 Maths Chapter 9 Exercise 9.4 Solution in Videos

#### Histogram

The bar graph is a pictorial representation of numerical data in the form of rectangles of equal width and varying heights. The dimensions of a rectangle depend on the numerical value it represents. Now, we will study to represent a continuous grouped frequency distribution graphically. The graphical representation of a continuous grouped frequency distribution is called a histogram.

Histogram is a type of bar diagram where the class intervals are shown on the horizontal axis and the heights of the bars shows the frequency of the class intervals. It is a vertical bar graph with no spacing between the bars.

##### Steps to draw a histogram:

1. Draw two lines, one horizontal and other vertical, intersecting at O (say). Mark them as OX and OY representing x-axis and y-axis respectively.

2. Choose a suitable scale for x-axis and represent class limits along this axis.

3. Choose a suitable scale for y-axis (not necessarily same as x-axis) and represent frequencies along this axis.

4. Construct rectangles with class-intervals as bases and respective frequencies as heights, so that areas of rectangles are proportional to the frequencies of corresponding classes.

##### How are histograms used in real life?

The primary use of a Histogram Chart is to display the distribution (or “shape”) of the values in a data series. For example, we might know that normal human oral body temperature is approx 98.6 degrees Fahrenheit. … To test this, we might sample 300 healthy persons and measure their oral temperature.

##### What information can be found in a histogram?

A histogram is used to summarize discrete or continuous data. In other words, it provides a visual interpretation. This requires focusing on the main points, factsof numerical data by showing the number of data points that fall within a specified range of values (called “bins”). It is similar to a vertical bar graph.

##### How do you describe a bimodal histogram?

Basically, a bimodal histogram is just a histogram with two obvious relative modes, or data peaks. … This makes the data bimodal since there are two separate periods during the day that correspond to peak serving times.

##### What is a symmetrical histogram?

A symmetric distribution is one in which the 2 “halves” of the histogram appear as mirror-images of one another. A skewed (non-symmetric) distribution is a distribution in which there is no such mirror-imaging.

##### How do you describe a normal distribution histogram?

Just by looking at a probability histogram, you can tell if it is normal by looking at its shape. If the graph is approximately bell-shaped and symmetric about the mean, you can usually assume normality. A normal probability plot is another method used to assess normality.