How to work out raito into fractions

I am assuming you mean Ratio into Fraction.

It is really simple, actually. Just put one number on top of another (divide would be a better word).

I have a ratio A:B, which is 1:2.

I can put 1 on top of 2 to create the fraction 1/2 to say that A is 1/2 of B.

A=1/2B

I can also put 2 on top of 1 to create the fraction 2/1 to say that B is 2/1 of A, or 2 times of A.

B=2A

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