In a certain mid-size city, 90% of the high school graduates are from public schools and the other 10% are from private schools.
of the private school grads, 80% go on to complete college, but
only 50% of the public school grads complete college.
What is the probability a randomly selected graduate completes college and
attends a public school?
Remember, when we want to calculate an AND probability, we need to
MULTIPLY
Hint: Construct a tree diagram for this example,

7

step-by-step explanation:

i'm assuming you need to figure out how many campers go into each tent.

i got the answer by:

24+4=28

28/4=7  

85.560%

step-by-step explanation:

conditional probability is defined as:

p(a|b) = p(a∩b) / p(b)

in other words, the probability that a occurs, given that b has occurred = the probability that both a and b occur / the probability that b occurs.

in this example:

p(turns 64 | turns 44) = p(turns 64 & turns 44) / p(turns 44).

if someone turns 64, they must have already turned 44, so:

p(turns 64 | turns 44) = p(turns 64) / p(turns 44)

on page 42, we see that of the original 100,000, 94944 turn 44, and 81234 turn 64.   therefore:

p(turns 64 | turns 44) = 81234 / 94944

p(turns 64 | turns 44) = 0.85560

if the probability is 1/12, 75 people will receive a $25 gift card

step-by-step explanation: