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प्रश्न
Define the following term:
Frequency of an observation
उत्तर
Frequency of an observation is the number of times a certain value or a class of values occurs.
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संबंधित प्रश्न
Define the following term:
Frequency distribution
Define the following term:
Class-size
Define the following term:
Class limits
The final mark in mathematic of 30 student are as follow:
| 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 |
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?
Prepare a frequency table of the following scores obtained by 50 students in a test:
| 42, | 51, | 21, | 42, | 37, | 37, | 42, | 49, | 38, | 52, | 7, | 33, | 17, |
| 44, | 39, | 7, | 14, | 27, | 39, | 42, | 42, | 62, | 37, | 39, | 67, | 51, |
| 53, | 53, | 59, | 41, | 29, | 38, | 27, | 31, | 64, | 19, | 53, | 51, | 22, |
| 61, | 42, | 39, | 59, | 47, | 33, | 34, | 16, | 37, | 57, | 43, |
In a study of number of accidents per day, the observations for 30 days were obtained as follows:
| 6, | 3, | 5, | 6, | 4, | 3, | 2, | 5, | 4, | 2, | 4, | 2, | 1, | 2, | 2, |
| 0, | 5, | 4, | 6, | 1, | 6, | 0, | 5, | 3, | 6, | 1, | 5, | 5, | 2, | 6 |
Prepare a frequency distribution table.
Following figures relate to the weekly wages (in Rs) of 15 workers in a factory:
300, 250, 200, 250, 200, 150, 350, 200, 250, 200, 150, 300, 150, 200, 250
Prepare a frequency table.
(i) What is the range in wages (in Rs)?
(ii) How many workers are getting Rs 350?
(iii) How many workers are getting the minimum wages?
The marks obtained by 40 students of class VIII in an examination are given below:
16, 17, 18, 3, 7, 23, 18, 13, 10, 21, 7, 1, 13, 21, 13, 15, 19, 24, 16, 3, 23, 5, 12, 18, 8, 12, 6, 8, 16, 5, 3, 5, 0, 7, 9, 12, 20, 10, 2, 23.
Divide the data into five groups, namely 0-5, 5-10, 10-15, 15-20 and 20-25 and prepare a grouped frequency table.
The marks scored by 40 students of class VIII in mathematics are given below:
81, 55, 68, 79, 85, 43, 29, 68, 54, 73, 47, 35, 72, 64, 95, 44, 50, 77, 64, 35, 79, 52, 45, 54, 70, 83, 62, 64, 72, 92, 84, 76, 63, 43, 54, 38, 73, 68, 52, 54.
Prepare a frequency distribution with class size of 10 marks.
The monthly wages of 30 workers in a factory are given below:
830, 835, 890, 810, 835, 836, 869, 845, 898, 890, 820, 860, 832, 833, 855, 845, 804, 808, 812, 840, 885, 835, 836, 878, 840, 868, 890, 806, 840, 890.
Represent the data in the form of a frequency distribution with class size 10.
Construct a frequency table with equal class intervals from the following data on the monthly wages (in rupees) of 28 labourers working in a factory, taking one of the class intervals as 210-230 (230 not included):
220, 268, 258, 242, 210, 268, 272, 242, 311, 290, 300, 320, 319, 304, 302, 318, 306, 292, 254, 278, 210, 240, 280, 316, 306, 215, 256, 236.
The data that can take values between a certain range is called ________
The following are the marks obtained by 30 students in a class test out of 20 in Mathematics subject.
| 11 | 12 | 13 | 12 | 12 | 15 | 16 | 17 | 18 | 12 |
| 20 | 13 | 13 | 14 | 14 | 14 | 15 | 15 | 15 | 15 |
| 16 | 16 | 16 | 15 | 14 | 13 | 12 | 11 | 19 | 17 |
Prepare a table using Tally Marks
The tally marks for the number 7 in standard form is _____________
The heights (in centimeters) of 40 children are.
| 110 | 112 | 112 | 116 | 119 | 111 | 113 | 115 | 118 | 120 |
| 110 | 113 | 114 | 111 | 114 | 113 | 110 | 120 | 118 | 115 |
| 112 | 110 | 116 | 111 | 115 | 120 | 113 | 111 | 113 | 120 |
| 115 | 111 | 116 | 112 | 110 | 111 | 120 | 111 | 120 | 111 |
Prepare a tally marks table
The data can be arranged in a tabular form using ______ marks.
In an examination, the grades achieved by 30 students of a class are given below. Arrange these grades in a table using tally marks:
B, C, C, E, A, C, B, B, D, D, D, D, B, C, C, C, A, C, B, E, A, D, C, B, E, C, B, E, C, D
The number of two wheelers owned individually by each of 50 families are listed below. Make a table using tally marks.
1, 1, 2, 1, 1, 1, 2, 1, 2, 1, 0, 1, 1, 2, 3, 1, 2, 1, 1, 2, 1, 2, 3, 1, 0, 2, 1, 0, 2, 1, 2, 1, 2, 1, 1, 4, 1, 3, 1, 1, 2, 1, 1, 1, 1, 2, 3, 2, 1, 1
Find the number of families having two or more, two wheelers.
Thirty students were interviewed to find out what they want to be in future. Their responses are listed as below:
doctor, engineer, doctor, pilot, officer, doctor, engineer, doctor, pilot, officer, pilot, engineer, officer, pilot, doctor, engineer, pilot, officer, doctor, officer, doctor, pilot, engineer, doctor, pilot, officer, doctor, pilot, doctor, engineer
Arrange the data in a table using tally marks.
Following is the choice of sweets for 30 students of Class VI.
| Ladoo, Barfi, Ladoo, Jalebi, Ladoo, Rasgulla, Jalebi, Ladoo, Barfi, Rasgulla, Ladoo, Jalebi, Jalebi, Rasgulla, Ladoo, Rasgulla, Jalebi, Ladoo, Rasgulla, Ladoo, Ladoo, Barfi, Rasgulla, Rasgulla, Jalebi, Rasgulla, Ladoo, Rasgulla, Jalebi, Ladoo. |
Arrange the names of sweets in a table using tally marks.
