12. A survey found that 5% of people believe thert they have seen q UFO. Choose a sample of 15 people at random. Fred the
probability of the following. Rand intermediate calculations
and final answers to at least 3 de.

for the first question it would be the second answer for the second question it would be the third answer and for the third question it would be the first answer

step-by-step explanation:

just sum

10 + 10 = 20

or

step-by-step explanation:

we need to solve for 'x' the following equation:  

we have that:

⇒

⇒ ⇒

factorizing, we get that:

  ⇒

then, the solutions are: or

nothing extraneous has been found!