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The number of times an observation occurs in a data is called its
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.
The mean weight of 100 students in a class is 46 kg. The mean weight of boys is 50 and of girls is 40 kg. Therefore, the number of boys is:
Let number of boys are x and then number of girls = (100x).
Thus,
50x+(100x)*40 = 46*100
→ x = 60.
Number of boys = 60.
Find the mean weight of the data set shown. 5 kg, 43 kg, 18 kg, 26 kg, 28 kg, 46 kg, 41 kg, 1 kg
Mean = Sum of mass weights / Total number of weighs
= (5 + 43 + 18 + 26 + 28 + 46 + 41 + 1)/8
= 26
A kennel can accommodate 12 dogs that weigh (in pounds) 6, 14, 23, 17, 19, 27, 39, 7, 33, 4, 11, and 13. Find the range of their weights.
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.
Find the mode for the data set, which shows the heights (in inches) of 10 students of Piyush’s class. 65, 60, 64, 61, 66, 67, 67, 67, 62, 77
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.
Following frequency distribution table shows marks (out of 50) obtained in English by 45 students of class VII. What is the size of class intervals?
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