Test: Data Handling - Class 7 MCQ

Explanation of Terms:

• Frequency: The count of how many times a specific data point or value appears in a dataset. For example, if the number 5 appears 10 times in a dataset, the frequency of the number 5 is 10.

• Range: The difference between the highest and lowest values in a dataset. For example, if the highest value is 20 and the lowest is 5, the range is 20 - 5 = 15.

• Raw Data: The original, unprocessed data collected from observations or measurements before any analysis or summary is done.

• Interval: In statistics, intervals are ranges of values within which data points fall. For example, if data is grouped into intervals like 10-20, 21-30, etc., each interval represents a range of values.

So, frequency is the term used to describe how many times a particular observation appears in a dataset.

The highest observation is the largest quantity in the interval. So 80 is the highest observation.

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

So option C is the correct answer.

The difference between the highest and lowest observation of a class interval is called the range.

Arranging the terms in ascending order 1, 3, 4, 5, 7, 8, 9

The median is the middle observation.

Therefore 5 is the median.

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. 

From the observation made, Apala scored the highest marks i.e. 600.

Mean = Sum of observations / No. of observations

= (65 + 72 + 98 + 84 + 60 + 108 + 160) / 7

= 647 / 7

= 92