Probability is the ratio of: the number of observations of an event n(A) compared to the total number of observation n(S). Generally it could be written as
P(A) =
Use combination to solve this problemThe event being observed n(A) in this problem is 2 engineers being selected from 4 engineers. The observation n(S) is about 2 people being selected from 10 people (engineers + pilots).
n(A) could be determined using combination of 2 engineers from 4 engineers
n(A) =
n(A) =
n(A) =
n(A) =
n(A) =
n(A) = 6
n(S) could be determined using combination of 2 people from 10 people
n(S) =
n(S) =
n(S) =
n(S) =
n(S) =
n(S) =
n(S) = 45
The probability
P(A) =
P(A) =
P(A) =
The probability is 2/15
Round .34 to .30, .1 to 0, and .25 to .30.
30 + 0 + 30 = 60.
In a 30 60 90 triangle, hypotenuse = short leg *2.
Therefore it is 8