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If the mean and variance of eight number...

If the mean and variance of eight numbers 3, 7, 9, 12, 13, 20, x and y be 10 and 25 respectively, then x.y is equal to _______.

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JEE MAINS PREVIOUS YEAR ENGLISH-JEE MAIN-MATHEMATICS
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  2. If system of equation x + y + z = 6 x + 2y + 3z = 10 3x + 2y + l...

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  3. If the mean and variance of eight numbers 3, 7, 9, 12, 13, 20, x and y...

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  4. Let X = {x : 1 le x le 50, x in N} A = {x: x is multiple of 2} B = {...

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  5. If F(x) is defined in x in (-1/3,1/3) f(x) = {((1/x)loge((1+3x)/(1-2...

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  7. Let P(A) = 1/3 , P(B) = 1/6 where A and B are independent events then

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  8. Let f(x) = {(sin (tan^(-1) x) + sin (cot^(-1) x)}^2 - 1, where |x| gt ...

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  9. f(x) = (8^(2x) - 8^(-2x))/(8^(2x) + 8^(-2x) find the inverse of the fu...

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  11. If y^2 = ax and x^2 = ay intersect at A & B. Area bounded by both curv...

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  12. Let F:R to R be such that F for all x in R (2^(1+x)+2^(1-x)), F(x) and...

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  13. Consider a function f(x) = ln ((x^2 + alpha)/(7x)) . If for the given ...

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  14. Let f(x) = x cos^(-1)(-sin|x|), x in (-pi/2,pi/2)

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  15. Let the line y=mx and the ellipse 2x^(2)+y^(2)=1 intersect at a point ...

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  16. The shortest distance between the lines (x-3)/3=(y-8)/(-1)=(z-3)/1 a...

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  17. Which of the following is tautology

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  18. Let P be a point on x^2 = 4y. The segment joining A (0,-1) and P is di...

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  19. Mean and standard deviations of 10 observations are 20 and 2 respectiv...

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  20. If volume of parallelopiped whose there coterminous edges are vec u = ...

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