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In a batch of 20 students, 8 have failed. The marks of the successful candidates are 23, 27, 29, 18, 17, 19,21, 27, 20, 24, 26, 28 the median marks are

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Important Questions on Statistics

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JEE Main
IMPORTANT
Mathematics Crash Course JEE Main>Chapter 27 - Statistics>Level 1>Q 3
If the mean of first n natural numbers is equal to n+73, then n is equal to
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JEE Main
IMPORTANT
Mathematics Crash Course JEE Main>Chapter 27 - Statistics>Level 1>Q 4
The mean of first three terms is 14 and mean of next two terms is 18. The mean of all the five terms is
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IMPORTANT
Mathematics Crash Course JEE Main>Chapter 27 - Statistics>Level 1>Q 5
If the mean of five observations x,x+2,x+4,x+6 and x+8 is 11, then the mean of last three observations is
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IMPORTANT
Mathematics Crash Course JEE Main>Chapter 27 - Statistics>Level 1>Q 6
The mean of 9 terms is 15. If one new term is added and mean become 16, then the value of new term is:
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JEE Main
IMPORTANT
Mathematics Crash Course JEE Main>Chapter 27 - Statistics>Level 1>Q 7
If α variable takes the discrete values α+4, α-72, α-52, α-3, α-2, α+12, α-12, α+5; α>0, then the median is
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IMPORTANT
Mathematics Crash Course JEE Main>Chapter 27 - Statistics>Level 1>Q 8
The mean of 11 observations is 25. If each observation is decreased by 5, the new mean will be
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JEE Main
IMPORTANT
Mathematics Crash Course JEE Main>Chapter 27 - Statistics>Level 1>Q 9
The mean square deviation about -1 and +1 of a set of observations are 7 and 3 respectively then standard deviation of the set is :-
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JEE Main
IMPORTANT
Mathematics Crash Course JEE Main>Chapter 27 - Statistics>Level 1>Q 10
Variance of the group α,α+2,α+4,α+6, upto n terms α≠0 is :-