Consider the following frequency distribution:

Class	$0-5$	$6-11$	$12-17$	$18-23$	$24-29$
Frequency	$13$	$10$	$15$	$8$	$11$

The upper limit of the median class is

The formula $\ldots \ldots$ represents the empirical relationship between the measures of central tendency.

Find the median of the following frequency distribution:

Class	$30-35$	$35-40$	$40-45$	$45-50$	$50-55$	$55-60$	$60-65$	$65-70$	$70-75$
Frequency	$1$	$2$	$5$	$10$	$17$	$15$	$9$	$5$	$3$

Find the median of the following frequency distribution:

Class	$65-85$	$85-105$	$105-125$	$125-145$	$145-165$	$165-185$	$185-205$
Frequency	$4$	$5$	$13$	$20$	$14$	$8$	$4$

The following are the ages of $300$ patients getting medical treatment in a hospital on a particular day:

Age (in years)	$10-20$	$20-30$	$30-40$	$40-50$	$50-60$	$60-70$
Number of patients	$60$	$42$	$55$	$70$	$53$	$20$

Form:
$(i)$ Less than type cumulative frequency distribution.
$(ii)$ More than type cumulative frequency distribution.

The median of an ungrouped data and the median calculated when the same data is grouped are always the same. Do you think that this is a correct statement? Give reason.