Q.18. Case study-II (Students studying in class room),
In a mathematics class, a teacher explain the concept for determining the mean by defining
the formula
Σ.
Further, a teachers give one example for explaining the above concept. The marks obtained
by 30 students of class X of a certain school in a paper of 100 marks are presented in table
below:
10-25
25-40
40-55
55-70
70-85
85-100
Class
Interval
No. of
Students
2
3
7
6
6
गणित की एक कक्षा में अध्यापक ने माध्य निकालने के लिए छात्रों को
Σ
के बारे में समझाया। अध्यापक ने उदाहरण देते हुए कहा कि कक्षा 10 के 100 नम्बर के पेपर
में 30 छात्रों के प्राप्तांक उपरोक्त तालिका में दिये है।
.. Find the number of students securing more then or equal to40 marks.
ऐसे छात्रों की संख्या बताओ जिन्होनें 40 या उससे ज्यादा प्राप्तांक प्राप्त किये।
ii.12
IIL.25
iv. 18
B. Find the cumulative frequency value in the inserval (40-55)
वर्ग अन्तराल (40-56) में संचवी बारम्बारता क्या होगी?
ii.12
iv.is
c. Through cumulative frequency table, which central measurement can be determined
संचयी बारम्बारता तालिका से कौन सी केन्द्रीय गाय का निर्धारण होता है।
Mca
Il Mode
Median
iv. None of these
माधिया
J
ween
Answers
Given : The marks obtained by 30 students of class X of a certain school in a paper of 100 marks
CI Students
10-25 2
25-40 3
40-55 7
55-70 6
70-85 6
85-100 6
To Find : number of students securing more then or equal to 40 marks.
cumulative frequency value in the interval (40-55)
Through cumulative frequency table, which central measurement can be determined.
Solution:
Marks f Cf
10-25 2 2
25-40 3 5
40-55 7 12
55-70 6 18
70-85 6 24
85-100 6 30
number of students securing more then or equal to 40 marks.
= 7 + 6 + 6 + 6
= 15
cumulative frequency value in the interval (40-55) = 12
Through cumulative frequency table, which central measurement can be determined. MEDIAN
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