Mathematics
Assertion (A): 30 children were asked about the number of hours they watched TV program everyday. The results are recorded as under.
| Number of hours | Frequency |
|---|---|
| 0 - 5 | 8 |
| 5 - 10 | 16 |
| 10 - 15 | 4 |
| 15 - 20 | 2 |
Then the number of children who watched TV for 10 or more hours a day is 22.
Reason (R): The assertion is not correct as the required number is 4 + 2 = 6.
A is true, but R is false.
A is false, but R is true.
Both A and R are true, and R is the correct reason for A.
Both A and R are true, and R is the incorrect reason for A.
Statistics
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Answer
10 or more hours covers the 10 – 15 and 15 – 20 classes.
4 students are there in 10 - 15 class.
2 students are there in 15 - 20 class.
Total students = 4 + 2 = 6
∴ A is false, but R is true.
Hence, option 2 is the correct option.
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In a frequency distribution, mid-values of the class is 10 and width of the class is 6, the lower limit of the class is :
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Statement 1: Let m be the mid-value and x be the upper limit of a class in the continuous frequency distribution, then the lower limit of this class is 2m - x.
Statement 2: For a given class: = mid-value of the class
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Ages No. of students Below 4 0 Below 7 85 Below 10 140 Below 13 243 Below 16 300 (i) State the number of students in the age group 10-13.
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