20 JEE Main 2021 Statistics previous-year questions with verified answers and step-by-step solutions.
These are the JEE Main 2021 previous-year questions from the Statistics chapter of Mathematics. Each links to a full solution with a verified answer key. To see the whole chapter across all years, visit the Statistics chapter hub.
Let the mean and variance of the frequency distribution x : x 1 = 2 x 2 = 6 x 3 = 8 x 4 = 9 f : 4 4 α β be 6…
Let n be an odd natural number such that the variance of 1 , 2 , 3 , 4 , … , n is 14 . Then n is equal to _______…
The first of the two samples in a group has 100 items with mean 15 and standard deviation 3 . If the whole group has 25…
If the mean and variance of the following data: 6 , 10 , 7 , 13 , a , 12 , b , 12 are 9 and 37 4 respectively, then a -…
If the variance of 10 natural numbers 1 ,   1 ,   1 ,   … ,   1 ,   k is less than 10 ,…
The mean and standard deviation of 20 observations were calculated as 10 and 2 . 5 respectively. It was found that by m…
Consider three observations a , b and c such that b = a + c . If the standard deviation of a + 2 , c + 2 is d , then wh…
Consider the following frequency distribution: Class: 0 - 6 6 - 12 12 - 18 18 - 24 24 - 30 Frequency: a b 12 9 5 If mea…
An online exam is attempted by 50 candidates out of which 20 are boys. The average marks obtained by boys is 12 with a…
Consider a set of 3 n numbers having variance 4 . In this set, the mean of first 2 n numbers is 6 and the mean of the r…
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