Test: Data Handling

Data available in an unorganised form are called raw data. The number of times a particular observation occurs in a given data is called its frequency.

Upper limit is the largest quantity in the interval. So 80 is the upper limit

Class mark is the midpoint of the upper and lower limits.
so for the given problem; the class mark is
[(95+100)÷2] = 97.5 
Thus class mark is 97.5 

So option C is the correct answer.

The difference between the upper and lower limit of a class interval is called the class size of the class interval.

Let number of boys are x and then number of girls = (100-x).
Thus,
50x+(100-x)*40 = 46*100
→ x = 60.
Number of boys = 60.

Mean =  Sum of mass weights / Total number of weighs

= (5 + 43 + 18 + 26 + 28 + 46 + 41 + 1)/8

= 26

The Range is the difference between the lowest and highest values.

Here the highest value is 39 and the lowest value is 4 

So Range = Highest Value - Lowest Value

                  = 39 - 4 = 35 

So option B is the correct answer. 

the mode of a set of numbers is the number that appears most often in the set.

Since the number 67 appears the most . So the mode of the given data is 67.

So option B is the correct answer.