The following are the marks obtained in Maths by students of Class 8:
51, 94, 34, 20, 50, 81, 81, 90, 76, 34, 51, 86, 93, 99, 26, 54, 85, 71, 88, 40, 44, 56, 55, 57, 78, 53, 81, 78, 65, 78.
The data have to be grouped to find the mean marks. One of the class intervals made is 60-70.

What is the frequency of the last class interval?

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Solution

The correct option is D 4
$\begin{matrix} C l a s s i n t e r v a l & F r e q u e n c y (f_{i}) 20 - 30 & 2 30 - 40 & 2 40 - 50 & 2 50 - 60 & 8 60 - 70 & 1 70 - 80 & 5 80 - 90 & 6 90 - 100 & 4 \sum f_{i} = 30 \end{matrix}$
From the frequency distribution table, one can infer that, the frequency of the last class interval is = 4.

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Q. The following are the marks obtained in Maths by students of Class 8:
51, 94, 34, 20, 50, 81, 81, 90, 76, 34, 51, 86, 93, 99, 26, 54, 85, 71, 88, 40, 44, 56, 55, 57, 78, 53, 81, 78, 65, 78.

Group the data and find out how many students scored between 60 and 70?

The marks obtained by 10 students in a class are as follows, what is the probability that the average mark obtained by a student in the class is less than 70?(in decimals)

$\begin{matrix} Student & English & Hindi & Mathematics & Science 1 & 87 & 78 & 90 & 89 2 & 90 & 68 & 76 & 78 3 & 79 & 68 & 59 & 61 4 & 71 & 67 & 79 & 57 5 & 69 & 91 & 86 & 76 6 & 87 & 85 & 67 & 60 7 & 78 & 90 & 89 & 93 8 & 92 & 76 & 88 & 90 9 & 77 & 81 & 85 & 86 10 & 86 & 75 & 93 & 89 \end{matrix}$

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The following are the marks obtained in Maths by students of Class 8:
51, 94, 34, 20, 50, 81, 81, 90, 76, 34, 51, 86, 93, 99, 26, 54, 85, 71, 88, 40, 44, 56, 55, 57, 78, 53, 81, 78, 65, 78.
The data have to be grouped to find the mean marks.
One of the class intervals made is 60-70.
How many should such class intervals be prepared?
What is the frequency of the last class interval?
What is $\sum f_{i}$ ?

The marks obtained by 10 students in a class are as follows, what is the probability that the average mark obtained by a student in the class is less than 70?(in decimals)

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The correct option is D 4Class intervalFrequency(fi)20−30230−40240−50250−60860−70170−80580−90690−1004∑fi=30 From the frequency distribution table, one can infer that, the frequency of the last class interval is = 4.