a bag contains only red bricks and blue bricks. there is a total of 20 bricks in the bag. the probability that a brick taken at random from the will be red is ⅖. how many blue bricks are there in the bag.

there is 12 blue bricks

Step-by-step explanation:

if you have 2/5 and the denominator needs to be 20 because there is 20 bricks in all you multiply 5 by whatever number to get to 20 in this case its 4 then if you multiply the denominator by 4 you have to multiply your numerator by 4 making it 8/20 then you subtract 8 from 20 because ow you know how many red bricks there are and if you subtract that gives you 12.

hope this helps :)

i am sorry it just submitted an answer but the answer is 365 boys. hopes this

step-by-step explanation:

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