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The directional derivative of the function f(x, y) = 2x In(y) in the direction v =< 0,1 > at the point (1,1) is equal to 2. Select one: O True False
Write the parametric equations
x=2siny=4cos0
in the given Cartesian form.
y^2/16= with x0.
Write the parametric equations
x=2sin2y=5cos2
in the given Catesian form.
y= with 0x2.
Write the parametric equations
x=4ety=8e−t
as a function of x in Cartesian form.
y= with x0.
Write the parametric equations x = 2 sin 0, y = 4 cos 0, 0<O< in the given Cartesian form. = with x > 0. 16 Write the parametric equations x = 2 sin’e, y = 5 cos?...
2. Suppose X and Y are continuous random variables with joint density function f(x, y) = 1x2 ye-xy for 1 < x < 2 and 0 < y < oo otherwise a. Calculate the (marginal) densities of X and Y. b. Calculate E[X] and E[Y]. c. Calculate Cov(X,Y).
which of the following is a potential function for F(x,y,z)= < y2 +y?ex?,x2 + 2ye*?,xy + xy?e *V> f(x,y,z) = xyz + y2exyz f(x,y,z) = xyz + y2e*+2 b. F(x,y,z) has a potential function but it is not one of the other choices. F(x,y,z) does not have a potential function. d. f(x,y,z) = xyz + y2exZ e.
Q4 Spline 5 Points A spline function is a smooth interpolation. O True O False Q5 Polynomial 5 Points For-1 < x < 1 the expression cos(n arccos x) is a polynomial of degree n. True False
3.98 Let X be a continuous random variable with probability density function f(x) defined on = {xl-π/2 < x < π/2). Give an expression for VIsinX)
Suppose that f (x II 2y), 0 < x < 1,0 < y < 1. Find EX + Y).
solve for c such that f(x,y) is a valid density function.
Seiten f(x, y) = 1<x<y <3 otherwise 0,
Determine the value of such that the function f (x, y) = cxy for 0<x<3 and 0 <y<3 satisfies the properties of a joint probability density function. Determine the following. Round your answers to four decimal places (e.g. 98.7654). 1.0994 P&<2,Y<3) 7.4444 P(X<2.0) 21:1878 Pu<Y<1,7) 12489 P(X>1.8,1 <Y<2.5) 7:3733 EX) P(X < 0,8< 4)
8. Let the joint density function of X and Y be 36 if 1 < x = y < 6 f(x, y) = { if 1<x<y < 6. What is the correlation coefficient of X and Y ?