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प्रश्न
The final marks in mathematics of 30 students are as follows:
53, 61, 48, 60, 78, 68, 55, 100,67,90
75,88,77,37,84,58,60,48,62,56
44, 58, 52, 64, 98, 59, 70, 39, 50, 60
(i) Arrange these marks in the ascending order, 30 to 39 one group, 40 to 49 second group etc.
Now answer the following:
(ii) What is the highest score?
(iii) What is the lowest score?
(iv) What is the range?
(v) If 40 is the pass mark how many have failed?
(vi) How many have scored 75 or more?
(vii) Which observations between 50 and 60 have not actually appeared?
(viii) How many have scored less than 50?
उत्तर
The final marks in mathematics of 30 students are as follows:
53, 61, 48, 60, 78, 68, 55, 100, 67, 90, 75, 88, 77, 37, 84, 58, 60, 48, 62, 56, 44, 58, 52, 64,
98, 59, 70, 39, 50, 60.
| (i) | Group | Observations |
| I(30–39) | 37, 39 | |
| II(40–49) | 44, 48, 48 | |
| III(50–59) | 50, 52, 53, 55, 56, 58, 58, 59 | |
| IV(60–69) | 60, 60, 60, 61, 62, 64, 67, 68 | |
| V(70–79) | 70, 55, 77, 78 | |
| VI(80–89) | 84, 88 | |
| VII(90–99) | 90, 98 | |
| VIII(100–109) | 100 |
(ii) Highest score = 100
(iii) Lowest score = 37
(iv) Range = 100 – 37 = 63
(v) If 40 is the pass mark, 2 students have failed
(vi) 8 students have scored 75 or more
(vii) Observation 51, 54, 57 between 50 and 60 have not actually appeared
(viii) 5 students have scored less than 50
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संबंधित प्रश्न
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2. Weights of students of our class
3. Production of wheat in the last 10 years in our country
4. Number of plants in our locality
5. Rainfall in our city in the last 10 years
Why do we group data?
Write the class-size in each of the following:
(i) 0 – 4, 5 – 9, 10 – 14
(ii) 10 – 19, 20 – 29, 30 – 39
(iii) 100 – 120, 120 – 140, 160 – 180
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(v) 5 – 5.01, 5.01 − 5.02, 5.02 – 5.03
The weights of new born babies (in kg) in a hospital on a particular day are as follows:
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(ii) Determine the highest weight.
(iii) Determine the lowest weight.
(iv) Determine the range.
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(vi) How many babies weigh below 2.5 kg?
(vii) How many babies weigh more than 2.8 kg?
(viii) How many babies weigh 2.8 kg?
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(ii) Write the class-marks of each interval.
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Information of attendance of every student collected by visiting every class in a school.
Classify following information as primary or secondary data.
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Classify following information as primary or secondary data.
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Which of the following data is not primary?
