What is histogram?

Is its 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

In the fig. there is a histogram depicting daily wages of workers in a factory. Construct the frequency distribution table

The following graph represents the ages of 25 teachers of a school : From the bars of this histogram, we can answer the following questions : How many teachers are of age 45 years or more but less than 50 years ?

The following graph represents the ages of 25 teachers of a school : From the bars of this histogram, we can answer the following questions : How many teachers are of age less than 35 years ?

The following graph is another historam (Fig.) From the bars of this histogram, we can answer the following questions : (i) How many teachers are of age 45 years or more but less than 50 years? (ii) How many teachers are of age less than 35 years?

What is biogas? What are its components ? What is the calorific value of biogas?

Observe the histogram and answer the questions given below : What information is being given by the histogram ?

Observe the histogram (Fig.) and answer the questions given below : What information is being given by the histogram ?