El departamento de personal de una empresa compró los regalos de fin de año se invirtieron USD 2800 en la compra de regalos el regalo para cada mujer costó USD 8 y para cada uno de los varones USD5 al finalizar el día se habían entregado todos los regalos. ¿Cuantas mujeres y varones recibieron su regalo?

if you are saying purchasing 3 social media ads and one newspaper ad counts as one purchase then there are:

6 purchases

if you are asking how many of each then:

18 social media ads

6 newspaper ads

9 x 8 divided by (5-3)=36

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

r = 78539458390583095803458309458039485093485 or just 3

step-by-step explanation: