# 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 (inyears) 0-20 20-40 40-60 60-80 80-100 Total Number ofpeople 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)