Q7 of 145 Page 407

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

Class mark is given by

Class mark of class 10 - 25 =


Class mark of class 35 - 55 =


∴ Class mark of class 10 - 25 is 17.5 and 35 - 55 is 45.


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5

For a certain distribution, mode and median were found to be 1000 and 1250 respectively. Find mean for this distribution using an empirical relation.

 6

In a class test, 50 students obtained marks as follows:



















Marks obtained



0 - 20



20 - 40



40 - 60



60 - 80



80 - 100



Number of students



4



6



25



10



5



Find the modal class and the median class.

 8

While calculating the mean of a given data by the Assumed - mean method, the following values were obtained:

A = 25, = 110, = 50.


Find the mean.

9

The distributions X and Y with Total number of observations 36 and 64, and mean 4 and 3 respectively are combined. What is the mean of the resulting distribution X + Y?