V.K. Ohri and T.R. Jain Economics chapter 9 solutions for class 11 statistics: Central tendency measures include: The arithmetic mean is regarded as a crucial principle that students should study extensively. T.R. Jain and V.K. Ohri solutions for class 11 are available here.
| Board | CBSE |
| Class | Class 11 |
| Subject | Statistics for Economics |
| Chapter | Chapter 9 |
| Chapter Name | Measures of Central Tendency- Arithmetic Mean |
| Number of questions solved | 05 |
| Category | T.R. Jain and V.K. Ohri |
T.R. Jain and V.K. Ohri Solutions for Class 11 Statistics for Economics Chapter 9 – Measures of Central Tendency- Arithmetic Mean
Question 1
Following are the marks obtained by eight students in statistics. Calculate the arithmetic mean.
| Marks | 15 | 18 | 16 | 45 | 32 | 40 | 30 | 28 |
Solution.
| Marks (X) |
| 15 18 16 45 32 40 30 28 |
| X= 224 |
Question 2
A train runs for 25 miles at a speed of 30 mph, another for 50 miles at a speed of 40 mph. Due to repairs of the track, the trains runs for 6 minutes at a speed of 10 mph and finally covers the remaining distance of 24 miles at a speed of 24 mph. What is the average speed in miles per hour?
Question 3
In a class of 50 students, 10 have failed and their average of marks is 2.5. The total marks secured by the entire class were 281. Find the average marks of those who have passed.
Question 4
Calculate the mean marks from the following data.
| Marks | 20-25 | 25-30 | 30-35 | 35-40 | 40-45 | 45-50 | 50-55 |
| Number of students | 10 | 12 | 8 | 20 | 11 | 4 | 5 |
Question 5
Calculate the weighted mean from the following data
| Marks | 60 | 75 | 63 | 59 | 55 |
| Weight | 2 | 1 | 5 | 5 | 3 |
0 Comments