Question

Question #e8654

Answer 1

`P("both work") = 1/15`

`P("at least 1 fail")=14/15`

Explanation:

Fractions are represented as parts of the whole of something. Consequently if you add up all the parts you should get a whole. The whole is expressed as 1. In that you may have 1 of a count of population of this country. So splitting the population into two equal counts is `1/2` of the population. That is `1/2` of 1 population.

So the sum of all probabilities is 1.
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`P("Both work") = 2/6xx1/5=1/15`

`P("At least 1 fail") =`1 - probability all good `= 1-1/15=14/15`

The logic hear is that if there is at least 1 bad then it is not possible to have all good. So you remove the all good `->1-1/15=14/15`