Andrea is considering two different cell phone plans. Each plan includes the same initial phone cost as well as a monthly fee. • Plan 1: 3 months of service for $215
Plan 2: 6 months of service for $371
If the monthly fee is the same for both plans, what is the cost of the phone?
.
A
$59.00
B
$61.83
С
$52.00
D
$156.00

step-by-step explanation:

yes

step-by-step explanation:

yes

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

step-by-step explanation:

(3rd option) - c