A.True

B.False

A.Expectation reflects the average level of random variable values

B.The greater the expectation the smaller the variance

C.Expectation and variance are both numerical characteristics of random variables

D.The variance reflects the degree of deviation between the random variable and its mathematical expectation

A.E(CX)=CE(X)

B.E(C)=C

C.E(X+Y)=E(X)+E(Y)

D.E(XY)=E(X)E(Y )

A.Mean

B.Accuracy

C.Recall

D.Sum

A.Index from left to right defaults from 1

B.Index from right to left defaults from 0

C.Index from right lo left defaults from -1

D.Index from left to right defaults from 0