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The mean and standard deviation of 15 - ...

The mean and standard deviation of 15 - observations are found to be 8 and 3 respectively. On rechecking it was found that in the observations, 20 was misread as 5. Then, the Correct variance is equal to _____

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The mean and standard deviation of 18 observations are found to be 7 and 4 respectively. On rechecking it was found that an observation 12 was misread as 21. Calculate the correct mean and standard deviation.

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The mean and standard deviation of 20 observations are found to be 10 and 2 respectively.One rechecking,it was found that an observation 8 was incorrect.Calculate the correct mean and standard deviation in each of the following cases.(i) If wrong item is omitted (ii) If it is replaced by 12.

The mean and variance of 20 observations are found to be 10 and 4. respectively. On rechecking, it was found that an observation 9 was incorrect and the correct observation was 11. Then the correct variance is

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The mean and standard deviation of "15" observations were found to be "12" and "3" respectively.On rechecking it was found that an observation was read as "10" in place of "12" .If mu and sigma^(2) denote the mean and variance of the correct observations respectively,then 15(mu+mu^(2)+sigma^(2)) is equal to

The mean and variance of 20 observations are found to be 10 and 4 respectively. On rechecking, it was found that an observation 8 is incorrect. If the wrong observation is omitted, then the correct variance is

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JEE MAINS PREVIOUS YEAR-JEE MAINS 2022-Mathematics-Section B
  1. If relation defined on set A= {1,2,3, . . .,50} , and relation R1 {(p,...

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  2. The number of real solutions of the equation e^(4x)+4e^(3x)-58e^(2x)+4...

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  3. The mean and standard deviation of 15 - observations are found to be 8...

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  4. veca=2hati+hatj+3hatk , vecb=3hati+3hatj+hatk & vecc=c1hati+c2hatk+c3h...

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  5. A ray of light passing tb.rough the point P (2, 3) reflects on the x-a...

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  6. Let l be a line which is normal to the curve y = 2x^2 + x + 2 at a poi...

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  7. Let A ={1, a1, a2 .. .... A(18).77} be a set of intgers with 1lta1lta2...

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  8. The number of positive integers k such that the constant term in the b...

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  9. The number of elements in the set {z=a+ibinCC:a,binZ and 1lt|z-3+2i|lt...

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  10. Let the lines y+2x=sqrt(11)+7sqrt7 and 2y+x=2sqrt(11)+6sqrt7 be norma...

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  11. Let S = {z in C: |z – 2| le 1, z(1 + i) + barz(1 - i) le2} . Let |z – ...

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  12. Let y = y(x) be the solution of the differential equation (dy)/(dx)+(s...

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  13. Let d be the distance between the foot of perpendiculars of the points...

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  14. The number of elements in the set S = { theta in [-4pi , 4pi] : 3 cos^...

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  15. The number of solutions of equation 2 theta -cos^2 theta + sqrt2=0 is

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  16. 50 tan(3tan^(-1)(1/2)+2cos^(-1)(1/sqrt5))+4sqrt2tan(1/2tan^(-1)(2sqrt2...

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  17. Let c, k in R. If f(x)=(c+1)x^(2) + (1-c^(2))x + 2k and f(x+y)=f(x) + ...

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  18. Let H: x^2/a^2 -y^2/b^2 = 1, a gt 0, bgt0, be a hyperbola such that th...

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  19. Let P1 : vecr (2hati + hatj - 3hatk) = 4 be a plane. Let P2 be anothe...

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  20. Let b1b2b3b4 be a 4-element permutation with bi in {1, 2, 3......., 1...

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