Q7 of 141 Page 8

Write the modal class for the following frequency distribution:





















Class-interval:



10-15



15-20



20-25



25-30



30-35



35-40



Frequency:



30



35



75



40



30



15


As class of maximum frequency is called modal class.


Modal class in above case is 20-25 as 75 is maximum frequency.


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5

Write the empirical relation between mean, mode and median.

 6

Which measure of central tendency can be determined graphically?

 8

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.

 9

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