In Brantley's high school, 23% of boys play football. 16% play football and
basketball. What percent of boys play basketball
given that they already play football?

should be roughly 30%

Step-by-step explanation:

23% is 2.3/10 and 16% is 1.6/10 so if you multiply both..

2.3*1.6 = roughly 3 plus I had the same question which was multiple choice out of 50%, 70%, 80%, and 30%

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

for future students the answer is b

hope i

-lavira: )