Advertisements
Advertisements
Question
Find the median of 21, 21, 22, 23, 23, 24, 24, 24, 24, 25 and 25
Solution
Given data = 21, 21, 22, 23, 23, 24, 24, 24, 24, 25 and 25
Clearly, middle term is 24.
∴ Median = 24
APPEARS IN
RELATED QUESTIONS
Find the mode of following data, using a histogram:
Class | 0 – 10 | 10 – 20 | 20 – 30 | 30 – 40 | 40 – 50 |
Frequency | 5 | 12 | 20 | 9 | 4 |
The mean of 1, 7, 5, 3, 4 and 4 is m. The numbers 3, 2, 4, 2, 3, 3 and p have mean m – 1 and median q. Find p and q.
The marks obtained by 120 students in a mathematics test is given below:
Marks | No. of students |
0 – 10 | 5 |
10 – 20 | 9 |
20 – 30 | 16 |
30 – 40 | 22 |
40 – 50 | 26 |
50 – 60 | 18 |
60 – 70 | 11 |
70 – 80 | 6 |
80 – 90 | 4 |
90 – 100 | 3 |
Draw an ogive for the given distributions on a graph sheet. Use a suitable scale for your ogive. Use your ogive to estimate:
- the median
- the number of student who obtained more than 75% in test.
- the number of students who did not pass in the test if the pass percentage was 40.
- the lower quartile.
Using a graph paper, draw an ogive for the following distribution which shows a record of the width in kilograms of 200 students.
Weight | Frequency |
40 – 45 | 5 |
45 – 50 | 17 |
50 – 55 | 22 |
55 – 60 | 45 |
60 – 65 | 51 |
65 – 70 | 31 |
70 – 75 | 20 |
75 – 80 | 9 |
Use your ogive to estimate the following:
- The percentage of student weighting 55 kg or more
- The weight above which the heaviest 30% of the student fall
- The number of students who are
- underweight
- overweight, If 55.70 kg is considered as standard weight.
The marks of 200 students in a test is given below :
Marks% | 10-19 | 20-29 | 30-39 | 40-49 | 50-59 | 60-69 | 70-79 | 80-89 |
No. of Students | 7 | 11 | 20 | 46 | 57 | 37 | 15 | 7 |
Draw an ogive and find
(i) the median
(ii) the number of students who scored more than 35% marks
The marks of 200 students in a test is given below :
Marks% | 10-19 | 20-29 | 30-39 | 40-49 | 50-59 | 60-69 | 70-79 | 80-89 |
No. of Students | 7 | 11 | 20 | 46 | 57 | 37 | 15 | 7 |
Draw an ogive and find the number of students who scored more than 35% marks
Find the mean of first five prime numbers.
Find the mean of the first six multiples of 5.
Find the mean of: 5, 2.4, 6.2, 8.9, 4.1 and 3.4
The mean of 18, 28, x, 32, 14 and 36 is 23. Find the value of x. Sum of data