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Answer
For city $X M=4.5$ booksFor city $Y M=3$ books$\therefore$ More books are read in city $X$.
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Define symmetric frequency distribution and state its characteristics.
The marks in a test for a group of students are as follows. Find the mean marks of these students.
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Marks
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$0-10$ | $10-20$ | $20-30$ | $30-40$ | $40-50$ | $50-60$ | $60-70$ |
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No. of students
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$3$ | $5$ | $12$ | $16$ | $11$ | $5$ | $4$ |
Discuss the method of collecting primary data by direct inquiry.
In usual notations find combined standard deviation from the following informations:
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→$n_{1}=10, \bar{x}_{1}=16, S_{1}=2 ; n_{2}=60, \bar{x}_{2}=$
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The workers in a factory are working in two shifts. Total number of workers is $5000$ . There are $2000$ workers in the first shift. In this shift, among the local workers, the number of male workers is $1200$ and the number of female workers is $300$ . In the second shift, among the local workers, the number of male workers is $2000$ and the number of female workers is $600$ . There are total $1200$ female workers in the factory, of them $500$ female workers are working in the first shift. Present the data in a tabular form.
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$(i)$ Exclusive frequency distribution and
$(ii)$ Frequency distribution showing mid value of each class.
→$(i)$ Exclusive frequency distribution and
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