Write the median class for the following frequency distribution:

Class-interval	0-10	10-20	20-30	30-40	40-50	50-60	60-70	70-80
Frequency	5	8	7	12	28	20	10	10

The shirt sizes worn by a group of 200 persons, who bought the shirt from a store, are as follows:

Shirt size	37	38	39	40	41	42	43	44
Number of persons	15	25	39	41	36	14	15	12

Find the model shirt size worn by the group.

Draw an ogive to represent the following frequency distribution:

Class-interval	0-4	5-9	10-14	15-19	20-24
No. of students	2	6	10	5	3

find the class marks of classes 10-25 and 35-55.

The following table gives production yield per hectare of wheat of 100 farms of a village:

Production yield	50-55	55-60	60-65	65-70	70-75	75-80 in kg per hecctare
Number of farms	2	8	12	24	38	16

Draw ‘less than’ ogive and ‘more than’ ogive.

Find the mode of the following distribution.

Class-interval	25-30	30-35	35-40	40-45	45-50	50-60
Frequency	25	34	50	42	38	14

A student draws a cumulative frequency curve for the marks obtained by 40 students of a class as shown below. Find the median marks obtained by the students of the class.

The monthly profits (in Rs.) of 100 shops are distributed as follows:

Profits per shop	0-50	50-100	100-150	150-200	200-250	250-300
No. of shops	12	18	27	20	17	6

Draw the frequency polygor it.

Find the mode of the following distribution.

Class-interval	10-15	15-20	02-25	25-30	30-35	35-40
Frequency	30	45	75	35	25	15

Calculate the mean for the following distribution:

x	5	6	7	8	9
f	4	8	14	11	3