A sample of 3 items is chosen at random from a box containing 20 items, out of which 4 are defective. Let X be the number of defective items in the sample. Find Var (X), σX, Var (20 − X) and σ20−X.

arithmetic sequence: a sequnce in which the diffrence between any two consecutive terms is the same

step-by-step explanation:

step-by-step explanation:

the answer is b: 18

step-by-step explanation:

use the pythagorean theorem to .

a^2+b^2=c^2

plug 18 for "r"

the 2 legs are 18 and 24

18^2+24^2=c^2

324+576=c^2

900=c^2

c=30

30-12=18

18 is the radius

: )

probably .5

i can on others if necessary.