Let {Zt} be a sequence of independent normal random variables, each with mean 0 and variance σ2, and let a, b, and c be constants. Which, if any, of the following processes are stationary? For each stationary process specify the mean and autocovariance function.
a. Xt = a + bZt + cZt−2
b. Xt = Z1 cos(ct) + Z2 sin(ct)
c. Xt = Zt cos(ct) + Zt−1 sin(ct)
d. Xt = a + bZ0
e. Xt = Z0 cos(ct)
f. Xt = ZtZt−1

your answer is b ^w^ hope i

cut 138 centimeters off

step-by-step explanation:

250-112 = 138

step-by-step explanation:

given that there are two triangles j'k'l' and jkl>

the former is got by dilating the second one.

when drawn on a grid, (graph paper) coordinates of vertices of first triangle is

(6,12)j, (9,6)k and (12,9)l

side jk has length = distance between j and k

=

side j'k'=distance between j' and k'

=

ie j'k'l' has sides 1/3 of that of corresponding sides of jkl.

hence scale factor of 1/3 is used to get j'k'l'from jkl