Mr. Rodgriguez has $180 and 40 students. He would like to gift everyone a reading book which $3.50 per book and a pencil box for each student. How much will each pencil box cost? *

The first step would be to multiply 3.50 by 40 to get 140 then you would subtract 180 by 140 to get 40 so each pencil box has to cost 1 dollar in order for each student to get a pencil box.

Step-by-step explanation:

The first step would be to multiply 3.50 by 40 to get 140 then you would subtract 180 by 140 to get 40 so each pencil box has to cost 1 dollar in order for each student to get a pencil box.

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