Advertisements
Advertisements
प्रश्न
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
(iv) 0 – 0.25, 0.25 – 0.50, 0.50 – 0.75
(v) 5 – 5.01, 5.01 − 5.02, 5.02 – 5.03
उत्तर
(i) 0 - 4, 5 - 9,10 - 14.
True class limits are 0.5- 4.5,4.5 - 9.5,9.5 - 14.5.
∴Class size=14.5-9.5 = 5
(ii) 10 - 19, 20 - 29, 30 - 39.
True class limits →10.5-19.5,19.5 - 29.5,29.5-39.5
Class size = 39.5-29.5
=10
(iii) 100 - 120,120 - 140,160 - 180.
Here the class limits and true class limits are the same
∴Class size 120-100=20
(iv) 0 - 0.25, 0.25-0.50, 0.50 - 0.75
Here the class limits and true class limits are the same
∴Class size = 0.25 - 0 = 0.25
(v) 5-5.01, 5.01-5.02, 5.02 - 5.03.
Here the class limits ad true class limits are the same
∴Class size = 5.01-5.0 = 0.01.
APPEARS IN
संबंधित प्रश्न
Give five examples of data that you can collect from day to day life.
Classify the given data as primary or secondary data.
In our day to day life, we can collect the following data.
1. Number of females per 1000 males in various states of our country
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?
The ages of ten students of a group are given below. The ages have been recorded in years
and months:
8 – 6, 9 – 0, 8 – 4, 9 – 3, 7 – 8, 8 – 11,8 – 7, 9 – 2, 7 – 10, 8 – 8
(i) What is the lowest age?
(ii) What is the highest age?
(iii) Determine the range?
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?
The weights of new born babies (in kg) in a hospital on a particular day are as follows:
2.3, 2.2, 2.1, 2.7, 2.6, 3.0, 2.5, 2.9, 2.8, 3.1, 2.5, 2.8, 2.7, 2.9, 2.4
(i) Rearrange the weights in descending order.
(ii) Determine the highest weight.
(iii) Determine the lowest weight.
(iv) Determine the range.
(v) How many babies were born on that day?
(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?
The number of runs scored by a cricket. player in 25 innings are as follows:
26, 35, 94, 48, 82, 105, 53, 0, 39, 42, 71, 0, 64, 1.5, 34, 67, 0, 42, 124, 84, 54, 48, 139, 64,47.
(i) Rearrange these runs in ascending order.
(ii) Determine the player, is highest score.
(iii) How many times did the player not score a run?
(iv) How many centuries did he score?
(v) How many times did he score more than 50 runs?
Classify following information as primary or secondary data.
Information of attendance of every student collected by visiting every class in a school.
Which of the following data is not primary?
The range of the data: 25, 18, 20, 22, 16, 6, 17, 15, 12, 30, 32, 10, 19, 8, 11, 20 is ______.
