A
What is the upper class limit of 25-35?
35
Give an example of primary data in the school context
Taking daily attendance
Poll is an example of ?
Primary data
The classes are 25-35and 35-45 . The 35 has come thrice in the data . 35 must be included in ......... class?
35-45
What is the class width of 25-35?
10
Find the class mark for 25-35?
30
Mode of 90,55,67,55,75,75,40,35,95,75, 90
55
find the median : 6,7,9,8,10
8
find the median 5,8,6,7,9,10
7.5
Calculate mean : 5,3,2,1,4
3
Application of mean in School context and mode in general life
Class average or individual student's average
Mode : To reorder the size of the shoes which had been sold in a shop
Application of median in school context
Planning the individualized support or advertising the result
Make inclusive class with class size or width of 1 for the following data
6,8,7, 5,6,7,8,7,8
Class frequency
5-6 3
7-8 6
Make exclusive data for 4,5,7,4,6 with class size as 1
Class frequency
4-5 2
5-6 1
6-7 1
7-8 1
Class width is 5; Classmarks is 6.5 ; frame the 2 equations
u+l= 13 and u-l= 5 ;
Years Wheat Jowar
2010 a b
2011 c d
If we have to draw the percentage bar graphs to show the production of crops in each year, What should be in 1) X axis 2) Yaxis 3) Formula for calculating percentage for wheat in 2010 and 2011
X axis = years Yaxis = % crop productions
a+b = M , then a/M *100 will give percentage of a
c+ d = N , then c/N *100 will give the percentage of c
Class A B
pass 30 40
total 50 80
how would you draw a percentage bar graph ?
X axis ?
Y axis ?
2 components are ??
Calculate %
Xaxis - class
Yaxis -% of students
total is given , so directly calculate 30/50 *100 and 40/80 *100
How a subdivided bar diagram is different from a percenatage bar diagram ?
Subdivided bar diagram - not marked till 100 and hence comparisons are difficult
The mean of of 100 observations is 40 . For one of the observations the correct value was 80 . It was mistakenly written as 50 . After correction , the new mean is ----------
40.3
class frequency
50-55 2
55-60 8
60-75 12
Make more than lower limit cumulative frequency and answer the following
How many farms yield more than 55kg ?
How many farms yield more than 60 kg ?
How many farms yield more tahn 50 kg ?
22
20
12
a)20
b) 12
c)22