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Question
The difference between the highest and lowest values of the observations is called
Options
frequency
mean
range
class-intervals
Solution
The difference between the highest and lowest values of the observations is called the range
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Three coins were tossed 30 times simultaneously. Each time the number of heads occurring was noted down as follows:-
| 0 | 1 | 2 | 2 | 1 | 2 | 3 | 1 | 3 | 0 |
| 1 | 3 | 1 | 1 | 2 | 2 | 0 | 1 | 2 | 1 |
| 3 | 0 | 0 | 1 | 1 | 2 | 3 | 2 | 2 | 0 |
Prepare a frequency distribution table for the data given above.
The value of π up to50 decimal places is given below:-
3.14159265358979323846264338327950288419716939937510
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(ii) What are the most and the least frequently occurring digits?
A company manufactures car batteries of a particular type. The lives (in years) of 40 such batteries were recorded as follows:-
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The marks scored by 55 students in a test are given below:
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Given below is a cumulative frequency distribution table showing the ages of people living in a locality:
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The mid-value of a class interval is 42. If the class size is 10, then the upper and lower limits of the class are:
The number of times a particular item occurs in a given data is called its
The following marks were obtained by the students in a test:
81, 72, 90, 90, 86, 85, 92, 70, 71, 83, 89, 95, 85, 79, 62
The range of the marks is
30 children were asked about the number of hours they watched TV programmes last week. The results are recorded as under:
| Number of hours | 0 – 5 | 5 – 10 | 10 – 15 | 15 – 20 |
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16, 13, 5, 80, 86, 7, 51, 48, 24, 56, 70, 19, 61, 17, 16, 36, 34, 42, 34, 35, 72, 55, 75, 31, 52, 28, 72, 97, 74, 45, 62, 68, 86, 35, 85, 36, 81, 75, 55, 26, 95, 31, 7, 78, 92, 62, 52, 56, 15, 63, 25, 36, 54, 44, 47, 27, 72, 17, 4, 30.
Construct a grouped frequency distribution table with width 10 of each class starting from 0 – 9.
