SOLUTION: So far, I have been able to figure out probabilities when they are exact, fewer, at least, or between numbers however, this one took me for a loop; the "or" has me puzzled. 45%

Algebra ->  Probability-and-statistics -> SOLUTION: So far, I have been able to figure out probabilities when they are exact, fewer, at least, or between numbers however, this one took me for a loop; the "or" has me puzzled. 45%       Log On


   



Question 1146299: So far, I have been able to figure out probabilities when they are exact, fewer, at least, or between numbers however, this one took me for a loop; the "or" has me puzzled.
45% of Americans were satisfied with their current jobs. Answer the following questions based on random sample of 15 American workers.
What is the probability that either four or five employees were satisfied with their current jobs?
Thank You!

Found 2 solutions by richwmiller, greenestamps:
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
If five were satisfied then four were

Answer by greenestamps(13214) About Me  (Show Source):
You can put this solution on YOUR website!


I don't see why "or" with two numbers is more confusing than "fewer than", or "at least", or "between a and b"....

P(4 are satisfied) = (15C4)*(.45^4)*(.55^11)
P(5 are satisfied) = (15C5)*(.45^5)*(.55^10)

Add the two probabilities....