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Statistics

Short Answer Type

261.

What is the lower limit of the modal class of the following frequency distribution ?

Age (in years)	0-10	10-20	20-30	30-40	40-50	50-60
Number of patients	16	13	6	11	27	18

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262. A student draws a cumulative frequency curve for the marks obtained by 49 students of a class as shown below, find the median marks obtained by the students of the class.

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263. What is the value of the median of the data using the graph in figure, of 'less than' ogive and 'more than ogive'?

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264. A student draws a cumulative frequency curve for the annual p r o f i to earned by 30 shops of a shopping c o m p l e x below, find the median profit obtained by the shops of shopping complex.

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265. 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.

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266. Write the formula for finding the mode for grouped data.

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267. What is the value of the median of the data using the graph in figure, of 'less than' ogive and 'more than ogive'?

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268. 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.

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269.

The marks obtained by 40 students of class X of a certain school in Science paper consisting of 10 marks are presented in the table below. Find the mean marks obtained by the students.

Marks obtained(x_i)	5	6	7	8	9
Number of students (f_i)	4	8	14	11	3

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270.
Consider the following distribution of daily wages of 50 workers of a factory.

Daily wages

100-120

120-140

140-160

160-180

180-200

No. of workers

12

14

8

6

10

Find the mean daily wages of the workers.

Daily wages (C.I.)	No. of workers (f_i)	Class-Mark (x_i)	f_i x_i
100 - 120	12	110	1320
120 - 140	14	130	1820
140 - 160	8	150	1200
160 - 180	6	170	1020
180 - 200	10	190	1900
	Σf_i = 50		Σf_i x_i = 7260