if you have dinner for 60 people everyone has two bottles of water how many bottles of water are needed each case of water has 40 how many cases are needed

120 bottles of water are needed. 3 cases are needed.

Step-by-step explanation:

If there are 60 people and they each have 2 bottles of water, we know that there are 120 bottles in total, 60x2 = 120.

There are 40 bottles in one case. Knowing this, we divide 120 by 40 to get that 3 cases are needed.

addition

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