Thirty percent of the cfa candidates have a degree in economics. a random sample of three cfa candidates is selected. what is the probability that at least one of them has a degree in economics?

This is an example of a random variable that follows Bernoulli distribution.

Whenever you perform experiments, with probability of success, the provability of havin successes is

In this case, you have (you choose a sample of 3 candidates), (30% of candidates have a degree in economics) and we want to be at least one.

One way to solve this is to consider that

But it is much quicker to observe that

And we have

So, the probability that at least one of them has a degree in economics is

c

step-by-step explanation:

5x+40

5(x + 8)

7x - 49

7(x - 7)

18x + 9

9(2x + 1)

15x - 10

5(3x - 2)

step-by-step explanation:

for number one all you have to do is factor 5 out of 5x + 40

for number 2 factor 7 out of 7x - 49

for number three factor 9 out of 18x + 9

for number four factor 5 out of 15x - 10