HARD
11th CBSE
IMPORTANT
Earn 100

Using short cut method, find the mean, variance and standand deviation for the data:

xi 10 15 18 20 25
fi 3 2 5 8 2

 

Important Questions on Statistics

HARD
11th CBSE
IMPORTANT

Using short cut method, find the mean, variance and standand deviation for the data:

xi 92 93 97 98 102 104 109
fi 3 2 3 2 6 3 3

 

HARD
11th CBSE
IMPORTANT

Using short cut method, find the mean, variance and standard deviation for the data:

 Class 0-1010-2020-3030-4040-50 Frequency 5815166

HARD
11th CBSE
IMPORTANT

Using short cut method, find the mean, variance and standard deviation for the data:

 Class 30-4040-5050-6060-7070-8080-9090-100 Frequency 371215832

HARD
11th CBSE
IMPORTANT

Using short cut method, find the mean, variance and standard deviation for the data:

 Class 25-3535-4545-5555-6565-75 Frequency 6413215314051

HARD
11th CBSE
IMPORTANT
 If the standard deviation of the numbers 2,3,2x,11 is 3.5, calculate the possible values of x.
EASY
11th CBSE
IMPORTANT
The variance of 15 observations is 6. If each observation is increased by 8, find the variance of the resulting observations.
EASY
11th CBSE
IMPORTANT
The variance of 20 observations is 5. If each observation is multiplied by 2. Find the variance of the resulting observations.
HARD
11th CBSE
IMPORTANT
The mean and variance of five observations are 6 and 4 respectively. If three of these are 5,7 and 9 , find the other two observations.