
Find the actual lower and upper class limits and also the class marks of the classes:
1.1-2.0, 2.1-3.0, 3.1-4.0
A) Actual lower limits: 1.05, 2.05, 3.05
Actual upper limits: 2.05, 3.05, 4.05
Class marks: 1.55, 2.55, 3.55
B) Actual lower limits: 1.5, 2.5, 3.5
Actual upper limits: 2.5, 3.5, 4.5
Class marks: 1.5, 2.5, 3.5
C) Data insufficient
D) None of these
Answer
502.8k+ views
Hint: Class mark is the mid point of the class interval. Upper limit is the highest value of the class interval.
Similarly, the lower limit is the smallest value of the class interval. For finding the actual upper limits and actual lower limits , we need to make the upper limit of a certain class and lower limit of the next class to be equal and same for the lower limit.
Upper limit is the highest value of the class interval and the actual upper limit is obtained by adding 0.5 to the highest number if the number is represented as a whole number or add 0.05 to the highest number if the number is represented as decimal.
Similarly, the lower limit is the smallest value of the class interval and the actual lower limit is obtained by subtracting 0.5 to the smallest number if the number is the whole number or subtract 0.05 to the smallest number if the number is decimal.
Complete step by step answer:
Given, class intervals are 1.1−2.0,2.1−3.0,3.1−4.0
Since, the intervals are represented in decimal; we add and subtract 0.05 to get the actual limits.
For class interval 1.1−2.0,
Class mark is
Actual upper limit is 2.0+0.05=2.05 and
actual lower limit is 1.1−0.05=1.05
Similarly for 2.1−3.0,
Class mark is
Actual upper limit is 3.0+0.05 = 3.05 and
actual lower limit is 2.1−0.05 = 2.05
Similarly for 3.1−4.0,
Class mark is
Actual upper limit is 4.0+0.05=4.05 and
actual lower limit is 3.1−0.05=3.05
Therefore, actual upper limits are 2.05,3.05,4.05
Actual lower limits are 1.05,2.05,3.05
Class marks are 1.55,2.55,3.55
Therefore the correct option is A.
Note:
Learn the differences between upper limit , lower limit, actual upper limit and actual lower limit. We should add 0.5 when it is a=whole number and 0.05 when it is a decimal for both lower limit and upper limit. Class mark is the midpoint of the class interval.
Similarly, the lower limit is the smallest value of the class interval. For finding the actual upper limits and actual lower limits , we need to make the upper limit of a certain class and lower limit of the next class to be equal and same for the lower limit.
Similarly, the lower limit is the smallest value of the class interval and the actual lower limit is obtained by subtracting 0.5 to the smallest number if the number is the whole number or subtract 0.05 to the smallest number if the number is decimal.
Complete step by step answer:
Given, class intervals are 1.1−2.0,2.1−3.0,3.1−4.0
Since, the intervals are represented in decimal; we add and subtract 0.05 to get the actual limits.
For class interval 1.1−2.0,
Class mark is
Actual upper limit is 2.0+0.05=2.05 and
actual lower limit is 1.1−0.05=1.05
Similarly for 2.1−3.0,
Class mark is
Actual upper limit is 3.0+0.05 = 3.05 and
actual lower limit is 2.1−0.05 = 2.05
Similarly for 3.1−4.0,
Class mark is
Actual upper limit is 4.0+0.05=4.05 and
actual lower limit is 3.1−0.05=3.05
Therefore, actual upper limits are 2.05,3.05,4.05
Actual lower limits are 1.05,2.05,3.05
Class marks are 1.55,2.55,3.55
Therefore the correct option is A.
Note:
Learn the differences between upper limit , lower limit, actual upper limit and actual lower limit. We should add 0.5 when it is a=whole number and 0.05 when it is a decimal for both lower limit and upper limit. Class mark is the midpoint of the class interval.
Recently Updated Pages
Master Class 11 Business Studies: Engaging Questions & Answers for Success

Master Class 11 Economics: Engaging Questions & Answers for Success

Master Class 11 Accountancy: Engaging Questions & Answers for Success

Master Class 11 Computer Science: Engaging Questions & Answers for Success

Master Class 11 Maths: Engaging Questions & Answers for Success

Master Class 11 English: Engaging Questions & Answers for Success

Trending doubts
Net gain of ATP in glycolysis a 6 b 2 c 4 d 8 class 11 biology CBSE

Name the Largest and the Smallest Cell in the Human Body ?

Where can free central placentation be seen class 11 biology CBSE

What is the chemical name of Iron class 11 chemistry CBSE

Spear grass Aristida is dispersed by A Air B Animal class 11 biology CBSE

What is the type of food and mode of feeding of the class 11 biology CBSE
