The following histogram shows the frequency distribution of the ages of $22$ teachers in a school:

What is the size of the classes?

The following histogram shows the frequency distribution f the ages of $22$ teachers in a school:

What are the class marks of the classes?

The weekly wages (in Rs.) of $30$ workers in a factory are given:
$830, 835, 890, 810, 835, 836, 869, 845, 898, 890, 820, 860, 832, 833, 855, 845, 804, 808, 812, 840, 885, 835, 835, 836, 878, 840, 868, 890, 806, 840$
Mark a frequency table with intervals as $800-810$, $810-820$ and so on, using tally marks. Also, draw a histogram and answer the following questions:

Which group has the maximum number of workers?

The weekly wages (in Rs.) of $30$ workers in a factory are given:
$830, 835, 890, 810, 835, 836, 869, 845, 898, 890, 820, 860, 832, 833, 855, 845, 804, 808, 812, 840, 885, 835, 835, 836, 878, 840, 868, 890, 806, 840$
Mark a frequency table with intervals as $800-810$, $810-820$ and so on, using tally marks. Also, draw a histogram and answer the following questions:

How many workers earn $\mathrm{Rs} 850$ and more?

The weekly wages (in Rs.) of $30$ workers in a factory are given:
$830, 835, 890, 810, 835, 836, 869, 845, 898, 890, 820, 860, 832, 833, 855, 845, 804, 808, 812, 840, 885, 835, 835, 836, 878, 840, 868, 890, 806, 840$
Make a frequency table with intervals as $800-810$, $810-820$ and so on, using tally marks. Also, draw a histogram and answer the following questions:

How many workers earn less than Rs $850$?