Statistics-Sample Questions

STATISTICS
PREVIOUS YEAR QUESTIONS
1.   Write the empirical relation between mean, mode and median.(AI CBSE 2009 C)
2.   Write the median class of the following distribution:(CBSE 2009)
Class Frequency
0-10 4
10-20 4
20-30 8
30-40 10
40-50 12
50-60 8
60-70 4
3.   What is the modal class of the following distribution.(CBSE 2009 F)
Age (in years) Number of patients
0-10 16
10-20 13
20-30 6
30-40 11
40-50 27
50-60 18
4.   Find the median (AI CBSE 2008)
Marks Frequency
0-10 8
10-20 10
20-30 12
30-40 22
40-50 30
50-60 18
5.   Find the class marks of classes 10-25 and 35-55 (AI 2008F)
6.   What is the median class of the grouped data(AI CBSE 2008 C)
Class Frequency
128-135 8
135-142 5
142-149 9
149-156 12
156-163 5
163-170 1
7.   Find the missing frequencies when the mean of dats is 53. (CBSE 2008)
Age (in
years)		 0-20 20-40 40-60 60-80 80-100 Total
Number of
people		 15 F1 21 F2 17 100
8.   The following table gives production yield per hectare of wheat of 100 farms of a village.( AI CBSE 2009 C)
Production yield Number of farms
40-45 4
45-50 6
50-55 16
55-60 20
60-65 30
65-70 24
        Change the distribution to a ‘more than type’ distribution and draw its ogive.
9.   The distribution below gives the weights of 30 students of a class. Find the mean and median weight of students (CBSE 2009 C)
Weight (in kgs) Number of students
40-45 2
45-50 3
50-55 8
55-60 6
60-65 6
65-70 3
70-75 2
10.   The lengths of 40 leaves of a plant are measured correct up to the nearest millimetre and the data is as under:
Length (in mm) Number of leaves
118-126 4
126-134 5
134-142 10
142-150 12
150-158 4
158-166 5
               Find the mean and median length of the leaves (CBSE 2009 C)