The mean of the data $\frac{4}{7}, \frac{4}{9}, \frac{3}{7}, \frac{5}{9}$ is ........

Observations of a data are $28, 16, 9, 17, 82, 71, 41, 18, 25, 15$. Find the range of the data.

The facts or figures,which are numerical or otherwise,collected with a definite purpose are called .......

Below is the distribution of "more than" type of marks obtained by $50$ students in a $100$ marks examination. Prepare the grouped frequency distribution from that.

Obtained marks	No. of Students
$0$ or more than $0$	$50$
$20$ or more than $20$	$48$
$40$ or more than $40$	$40$
$60$ or more than $60$	$31$
$80$ or more than $80$	$10$

The frequency distribution of the marks scored by $35$ students in a $60$ marks test is as below:

Marks scored	No. of students
$0-10$	$2$
$10-20$	$7$
$20-30$	$8$
$30-40$	$7$
$40-50$	$8$
$50-60$	$3$

Represent the data by a histogram.

To draw a histogram to represent the following frequency distribution:

Class interval	$5-10$	$10-15$	$15-25$	$25-45$	$45-75$
Frequency	$6$	$12$	$10$	$8$	$15$

The adjusted frequency for the class $25-45$ is: