An certain brand of upright freezer is available in three different rated capacities: 16 ft3, 18 ft3, and 20 ft3. Let X = the rated capacity of a freezer of this brand sold at a certain store. Suppose that X has the following pmf

x =16, p(x) = .2
x= 18, p(x) = .5
x=20, p(x) = .3
Compute E(X), E(X2), and V(X).

E(x)=18.2

E(x²)=333.2

V(x)=1.96

Step-by-step explanation:

Given that

x=16, p(x) =0 .2

x= 18, p(x) =0 .5

x=20, p(x) = 0.3

E(x)  :

E(x²) :

V(x) ::

d. 8

step-by-step explanation:

the given radical expression is:

we can rewrite this as:

we express as square numbers to get;

the exponents will now cancel out to give.

the correct answer is d