Joan went to her local zoo that featured 18 whale exhibits. If the zoo features 45 exhibits in total then what percent of the zo
1 answer:
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By definition of conditional probability,
Assuming a standard 6-sided fair die,
- if
, then
means
; otherwise,
- if
, then
.
Both outcomes are mutually exclusive with probability each, hence total probability
.
Of the 36 possible outcomes, there are 6 ways to sum the integers 1-6 to get 7:
(1, 6), (2, 5), (3, 4), (4, 3), (5, 2), (6, 1)
and so a sum of 7 occurs of the time.
Then the probability we want is
The answer is
First you must use distributive property to simplify.
Then, you must subtract 18 on both sides
Next, add 2 on both sides
Then, subtract 8x on both sides
Finally, Divide both sides by -2. Don't forget to switch the equality sign because the variable was changed to a positive using division.