Quartiles

Calculate the quartile deviation and its coefficient from the following data:

The probable value of mean deviation when $Q_3=40$ and $Q_1=15$ is

Class: $\begin{array}{lllll}0-10& 10-20& 20-30& 30-40& 40-50\end{array}$

Frequency: $\begin{array}{ccccc}5& 8& 15& 6& 4\end{array}$

For the class $20-30$, cumulative frequency is

If $x$ and $y$ are related as $3x+4y=20$ and the quartile deviation of $x$ is $12,$ then the quartile deviation of $y$ is

The quartiles of a variable are $45,52$ and $65$ respectively. Its quartile deviation is

The appropriate measure of dispersion for open-end classification is

Which measure is based on only the central fifty percent of the observations?

Which measures of dispersions is not affected by the presence of extreme observations?

Which one is an absolute measure of dispersion?

Which one is easier to compute?

Dispersion measures

If there are two groups with $75$ and $65$ as harmonic means and containing $15$ and $13$ observation then the combined HM is given by

Quartiles can be determined graphically using

Quartiles are the values dividing a given set of observations into

For $333, 999, 888, 777, 1000, 321, 133$
Rank of $3^{\mathrm{rd}}$ quartile is

For $333, 999, 888, 777, 666, 555, 444$
Rank of $1^{\mathrm{st} }$ quartile is

In Ogive, abscissa corresponding to ordinate $3 \mathrm{N}/4$ is

In Ogive, abscissa corresponding to ordinate $N/4$ is

In Ogive, abscissa corresponding to ordinate $N/2$ is

For grouped frequency distribution - ____ is equal to the value corresponding to cumulative frequency $3 \mathrm{N}/4$