MEDIUM
JEE Main
IMPORTANT
Earn 100

Let O be the mean deviation of the first five odd natural numbers about their mean and P be the mean deviation of the first five prime numbers about their mean. Then P-O=

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Important Questions on Statistics

MEDIUM
JEE Main
IMPORTANT
Which of the following data has minimum variance?
HARD
JEE Main
IMPORTANT
Let λ is the variance of first 50 odd natural number, then the value of λ-830 is equal to
MEDIUM
JEE Main
IMPORTANT
If a variate X is expressed as a linear function of two variates U and V in the form X=aU+bV, then Mean X¯ of X is
MEDIUM
JEE Main
IMPORTANT
In a group of students, the mean weight of boys is 65 kg, and mean weight of girls is 55 kg. If the mean weight of all students of group is 61 kg, then the ratio of the number of boys and girls in the group is
MEDIUM
JEE Main
IMPORTANT
If the mean of n observations 12,22,32,......n2 is 46n11, then n is equal to
MEDIUM
JEE Main
IMPORTANT
If x¯1 and x¯2 are means of two distribution, such that x¯1<x¯2 and x¯ is the mean of the joint distribution, then
MEDIUM
JEE Main
IMPORTANT
If the variance of 10 natural numbers 1, 1, 1, , 1, k is less than 10, then the maximum possible integral value of k is ___________.
HARD
JEE Main
IMPORTANT
The first of the two samples in a group has 100 items with mean 15 and standard deviation 3. If the whole group has 250 items with mean 15.6 and standard deviation 13.44, then the standard deviation of the second sample is: