Tag: bar graphs

Questions Related to bar graphs

Probability density functions are always

maths bar graphs histograms for non-uniform class widths histograms with unequal class intervals revisiting histograms

  1. decreasing

  2. increasing

  3. positive

  4. negative

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Correct Option: C
Explanation:

Probablity of a function is always greater than 0 i.e. positive

PDF in histogram equalization stands for

maths bar graphs histograms for non-uniform class widths histograms with unequal class intervals revisiting histograms

  1. probability dual function

  2. partial density function

  3. parametric density function

  4. probability density function

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Correct Option: D
Explanation:

PDF in histogram equalization stands for probability density function. 

Local histogram processing deals with

maths bar graphs histograms for non-uniform class widths histograms with unequal class intervals revisiting histograms

  1. whole image

  2. slices of image

  3. centre of image

  4. none of these

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Correct Option: B
Explanation:

In local histogram we deal with slice of images

Strictly monotonical function guarantee inverse mapping as

maths bar graphs histograms for non-uniform class widths histograms with unequal class intervals revisiting histograms

  1. single valued

  2. multi valued

  3. dual valued

  4. none of these

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Correct Option: A

Histogram is technique processed in

maths bar graphs histograms for non-uniform class widths histograms with unequal class intervals revisiting histograms

  1. intensity domain

  2. frequency domain

  3. spatial domain

  4. none of these

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Correct Option: C
Explanation:

Well known from application of histogram

The statistical data can be represented by diagram using 

maths bar graphs histograms for non-uniform class widths histograms with unequal class intervals revisiting histograms

  1. Histogram

  2. Frequency polygon

  3. Ogive

  4. None of these

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Correct Option: A,B,C
Explanation:

It is fundamental concept that a statistical data can be represented using plotting graph between different variable, pie chart, histogram, frequency polygon or frequency table or ogives.
Hence, $A,B,C$ are correct choices.

In a histogram, the area of each rectangle is proportional to the class size of the corresponding class interval? If not, correct the statement.
If true then enter $1$ and if false then enter $0$

maths bar graphs histograms for non-uniform class widths histograms with unequal class intervals revisiting histograms

  1. $1$

  2. $0$

  3. can't determine

  4. None of these

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Correct Option: B
Explanation:

No, this is not a correct statement.
In a histogram, horizontal axis represents the class intervals whose width is fixed & the varying data is plotted along the y-axis. So in all  the rectangles of a histogram, width remains same & the length changes.
So correct statement is "In a histogram, the area of each rectangle is proportional to the frequency of its class."

The width of a rectangle in a histogram represents ___________ of the class.

maths bar graphs histograms for non-uniform class widths histograms with unequal class intervals revisiting histograms

  1. frequency

  2. range

  3. class limit

  4. upper limit

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Correct Option: A
Explanation:

The height of the rectangle in the histogram represents the frequency.

For which of these would you use a histogram to show the data?
$(a)$ The number of letters for different areas in a postman's bag.
$(b)$ The height of competitors in an athletics meet.
$(c)$ The number of cassettes produced by $5$ companies.
$(d)$ The number of passengers boarding trains from $7{:}00$ a.m. to $7{:}00$ p.m. at a station.
Give reasons for each.

maths bar graphs histograms for non-uniform class widths histograms with unequal class intervals revisiting histograms

  1. $a$

  2. $b$

  3. $c$

  4. $d$

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Correct Option: B,D
Explanation:

Histograms are a special form of bar chart where the data represents continuously rather than discrete categories. This means that in a histogram there are no gaps between the columns representing the different categories.

The height of competitors are continuous data. There are no gaps between the data. 
Even the train timings are continuous data.   
Hence, option B and C are correct.

The diagram used to estimate mode of continuous frequency distribution graphically is _____

maths bar graphs histograms for non-uniform class widths histograms with unequal class intervals revisiting histograms

  1. histogram

  2. frequency curve

  3. bar diagram

  4. all of these

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Correct Option: A
Explanation:

It is fundamental concept that histogram is used to obtain mode from continuous frequency distribution graphically.