The lengths in centimetres (to the nearest centimetre) of 30 carrots are given as follows: 15, 22, 21, 20, 22,15, 15, 20, 20,15, 20, 18, 20, 22, 21, 20, 21, 18, 21, 18, 20, 18, 21, 18, 22, 20, 15, 21, 18, 20 Arrange the data given above in a table using tally marks and answer the following questions. (a) What is the number of carrots which have length more than 20 cm? (b) Which length of the carrots occur maximum number of times? Minimum number of times?