Suppose E(X) = 5 and E[X(X-1)] = 27.5. What is E(X2)? V(X)? The general relationship among the quantities E(X), E[X(X-1)], and V(X)?

Step-by-step explanation:

We have the following properties:

So, if we have that E[X(X-1)] = 27.5, we can write them using the first property as:

Then, replacing E(X) by 5 and solving for , we get:

Finally, using the second property and replacing by 5 and by 32.5, we get that V(X) is equal to:

answer: i can’t tell you that

step-by-step explanation:

δabc ≅ δdcb by sas because

db ≅ ac . . given (side)

bc ≅ bc . . reflexive property (side)

∠dbc ≅ ∠ acb . . alternate interior angles where transversal bc crosses parallel lines bd and ac (included angle)