In a sample of 26 hand-held calculators, 20 are known to be nonfunctional. If 6 of these calculators are selected at random, what is the probability that exactly 4 in the selection are nonfunctional? Round to the nearest thousandth.

A. 0.667
B. 0.316
C. 0.769
D. 0.300
E. 0

Question

In a sample of 26 hand-held calculators, 20 are known to be nonfunctional. If 6 of these calculators are selected at random, what is the probability that exactly 4 in the selection are nonfunctional? Round to the nearest thousandth.
	
A. 0.667
B. 0.316
C. 0.769
D. 0.300
E. 0

amistre64 · Answer

20 out of 26 are bad.... thats a ratio of:

20/26 = 10/13 = 1/1.3

1:1.3  =   6:x  i think will give the probablity of how many are bad

amistre64 · Answer

then 4/6 should give you something along the lines of figuring out the rest...