Jack is trying to determine how he can save money by cutting his electricity bill. he is currently on a standard use plan for electricity and pays 7.5 cents per kwh. he keeps track of when he uses electricity and is thinking about switching to an interval use plan for electricity which costs 3 cents per kwh for off-peak use and 15 cents per kwh for on-peak use. off-peak hours are from 8pm - 8am and on-peak hours are from 8am - 8pm will mark brainlest answer

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