The bookstore advertises 5 notebooks for $7.75 at this rate how much would 7 notebooks cost

10.85

Step-by-step explanation:

So with the ratio of 5 to 7.75 you would set up an equivalent ratio of 7 to ? to find your answer for? You do 5/7.75 and 7/? And cross multiply then divide the coefficient by itself on the side with the variable

$10.85

Step-by-step explanation:

you would divide 7.75 by five to get how much one notebook costs then you would multiply that by 7 to get the answer

14.3

step-by-step explanation:

add all the numbers together.

9 + 12 + 15 + 16 + 17 + 17 = 86

now, divide 86 by how many numbers we have: 6.

86 / 6 = 14.3

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