The lengths in ce

Tally marks means hash marks they are in the form of numerals used for counting.

Like 4 is written as means four line

And 5 is written as four lines with cross line.

Now after counting numbers of carrots having length 15cm =5

Numbers of carrots having length 18cm =6

Numbers of carrots having length 20cm =9

Numbers of carrots having length 21cm =6

Numbers of carrots having length 22cm =4

now arranging above in the form of table of tally marks

a) Numbers of carrots having length more than 20cm =6+4 =10cm

b) From the table, maximum number of carrots =9 which occurs at length 20cm and min no carrots =4 which occurs at length 22cm

Hence length of carrots occurring maximum number of time =20cm

And length of carrots occurring minimum number of time =22cm