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The mean and variance of the data 4,5,6,...

The mean and variance of the data `4,5,6,6,7,8,x,y,` where `x lt y` are 6 and `9/4` respectively. Then `x^4 + y^2` is equal to

A

162

B

320

C

674

D

420

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JEE MAINS PREVIOUS YEAR-JEE MAINS 2022-MATHEMATICS (SECTION - A)
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  3. For some alpha , beta in R , a = alpha- i beta. If system of equations...

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  4. Let A and B be two 3 xx 3 matrices such that AB = I and abs(A) = 1/8. ...

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  5. If S=2+6/7+12/7^2+20/7^3+. . . then find 4S

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  8. If f is differentiable function such that intcos x^1 t^2 f(t) dt =sin^...

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  9. The value of int0^1 dx/(7^[[1/x]]) is ( where [.] denotes the greatest...

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  10. If the solution curve of the differential equation ((tan^(-1)y)-x)dy =...

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  11. If the equation of the parabola, whose vertex is at (5, 4) and the dir...

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  12. The set of values of k, for which the circle C : 4x^2 + 4y^2 - 12 x +...

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  13. Let foot of perpendicular from point (1,2,4) on line (x+2)/4=(y-1)/2=(...

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  14. The shortest distance between the line (x-3)/2 = (y -2)/3 = (z - 1)/(-...

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  15. Let vec a and vec b be two vectors along diagonals of parallelogram ha...

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  16. The mean and variance of the data 4,5,6,6,7,8,x,y, where x lt y are 6 ...

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  17. If a point A(x, y) lies in the region bounded by the y-axis, straight ...

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  18. The value of cot(sum(n=1)^50 tan^-1((1)/(1+n+n^2))) is equal to

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  19. alpha = sin 36^@ is root of which of the following equation

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  20. Which of the following statement is a tautology ?

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