A survey regarding the heights (in $\mathrm{cm}$ ) of $51$ girls of class $\mathrm{X}$ of a school was conducted and the following data was obtained.

Height (in $\mathrm{cm}$)	Number of girls
Less than $140$	$4$
Less than $145$	$11$
Less than $150$	$29$
Less than $155$	$40$
Less than $160$	$46$
Less than $165$	$51$

Find the median height.

A life insurance agent found the following data for distribution of ages of $100$ policy holders. Calculate the median age, if policies are given only to persons having age $18$ years onwards but less than $60$ years.

The lengths of $40$ leaves of a plant are measured correct to the nearest millimeter, and the data obtained is represented in the following table:

Find the median length of leaf (in $\mathrm{mm}$)

An incomplete distribution is given as follows:

You are given that the median value is $35$ and the sum of all the frequencies is $170$. Using the median formula, fill up the missing frequencies. Also find the sum of frequencies.

The median of the distribution given below is $14.4$. Find the values of $x$ and $y$, if the total frequency is $20$. Find the sum of missing values.

The median of the following data is $50$. Find the values of $\mathrm{p}$ and $\mathrm{q}$, if the sum of all the frequencies is $90$. Also find the sum of missing frequencies.

Find the mode of $3, 5, 7, 4, 5, 3, 5, 6, 8, 9, 5, 3, 5, 3, 6, 9, 7, 4$.

Find the mode of the following data:

$3, 3, 7, 4, 5, 3, 5, 6, 8, 9, 5, 3, 5, 3, 6, 9, 7, 4$

Find the mode of the following data: $15,8,26,25,24,15,18,20,24,15,19,15$.