# iTutor Math Updates

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Hi everyone,
I am trying to workout how to calculate a person exposure to danger given the following made up information:
Chance of being hit by car = 1%
Chance of assault = 3%
Chance of dog attack = 0.5%
Chance of contracting deadly disease = 0.2%
How do I calculate the chances of being exposed to any of these possibilities? These are non conditional probabilities right?
So would I add up: 1+3+0.5+0.2 and divide by 400 (4 x 100%)? This doesn't seem right as the answer is 1.1% probability of being exposed to the harm.
Or is it: 1x3x0.5x0.2 and divide by 400? This also doesn't seem right as it results in 0.00075...
I am confused, I have googled unconditional probabilites but I did not find anything helpful. The links tend to say, it is the total number of "A" (so possible harm = 4.7) divided by "N" which is the overall number of possibilities (so 400). 4.7/400 doesn't seem right.
I want to make a formula that I can use to input information to test the probability of being hurt.
Any help would be appreciated.