The number of birdhouses Ben can make varies directly with the amount of time he spends making the birdhouses. He can make 2 birdhouses in 3 hours. How many birdhouses can he make in 9 hours? Estimate to the nearest whole number.

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

69.64%

step-by-step explanation:

48+y= ?

the y is the variable and the ? could also be a variable  

they can either have 0,1, or infinite solutions

step-by-step explanation: