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please help and make sure all the answers and work is right

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Oct 16th, 2017

So we know that P(event) is the number of desired outcomes divided by the number of total outcomes.


For part 1: it is desired that we select a prime number between 1 and 20. 
How many prime numbers exist between 1 and 20?

1,2,3,5,7,11,13,17,19  so that is 9 prime numbers. 
what is the total number of numbers between 1 and 20?
20 numbers total
so now we divide:
9/20 = 0.45

For part 2: the compliment is:
1 - 0.45 = 0.55
Mar 19th, 2015

its 0.4 and 0.6

Mar 19th, 2015

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