Your parents ask you to go to the grocery store to purchase some last minute items for dinner. You purchase a head of lettuce for $2.36 and a container of tomatoes for $4.89. The sales tax is 4%. What is your total , including sales tax?

7.54

Step-by-step explanation:

2.36+4.89=7.25

7.25×.04=.29

.29+7.25=7.54

use this formula:

p(a\b) = p(a and b)/p(b).

take it from here.

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