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Worksheetsstatistics test-1
Total questions: 20
Worksheet time: 40mins
The mean is :
the difference of the values of all the observations divided by the total number of observations.
the sum of the values of all the observations multiplied by the total number of observations.
the sum of the values of all the observations divided by the total number of observations.
none of them
The mean is represented by:
Xi
fi
x∑y fixi
x
The Greek letter sigma means:
average
mean
summation
division
the formula for mean is:
Four students who have obtained 40 marks would be considered in the class- interval:
25 - 40
40 -55
both
none
The formula to calculate the class mark of any class-interval:
The sum of values of all the observations divided by the total number of observations.
finding the mean using the formula x =∑xyfi∑xyfixi
direct method
assumed mean method
step deviation method
non
the value xi - a in the assumed mean method is :
ui
di
x
x∑yfi
The 'di' in assumed mean method is called:
deviation
direct method
division
dividend
finding the mean using this formula is:
direct method
assumed mean method
step deviation method
none
class size is represented by:
a
di
h
x∑yfi
The class size of the class-interval 10 -25 is :
10
25
15
17.5
Finding the mean using above formula is :
direct method
step - deviation method
assumed mean method
none
It is possible that more than one value may have the same maximum frequency. In such a situation the data is said to be:
Bimodal
Multimodal
Polymodal
Dimodal
The wickets taken by a bowler in 10 cricket matches are as follows: 2,6,4,5,0,2,1,3,2,3. find the mode?
6
2
0
3
A class with the maximum frequency is called:
Median Class
Modal Class
Class Mark
Class Size
The relation between mean and mode is that:
Mode is always less than the mean
Mode is always equal to mean
Mode is always more than mean
Mode can be less, or equal, or more than mean
Cumulative frequency is related to:
Assumed mean method
Median
Mode
Step-Deviation method
In the formula for calculating median, the cf represents:
Frequency of median class
Cumulative frequency of median class
Cumulative frequency of class preceding the median class
Cumulative frequency of the class succeeding the median class
The empirical relationship between the three measures of central tendency is:
2 Median = 3 Mode+Mean
1 Mean = 2 Mode+3 Median
2 Mean+1 Mode = 3 Median
Median = 2 Mean+3 Mode
