26.80 x .15 gives you the answer, which is $4.02 in tip
The easiest way to do this is to put each term in the numerator over the denominator and do the division/reducing for each one. Like this:
. The first term reduces to
, the second to
, and the third to 3. Putting them all together with the signs in between we have
Solution :
Faulty electrical connects = P(A) = 0.80
Mechanical defects = P(B) = 0.92
Mechanical defects are related to loose keys = P(C/B) = 0.27
Improper assembly = P(D/B) = 0.73
Defective wires = P(E/A) = 0.35
Improper connections = P(F/A) = 0.13
Poorly welded wires = P(G/A) = 0.52
Now, the probability due to loose keys = 0.27 x 0.92 = 0.2484
Improperly connected = 0.13 x 0.80 = 0.1040
Poorly welded wires = 0.52 x 0.80 = 0.4160
So, the probability that a failure is due to improperly connected or poorly welded wires = 0.1040 + 0.4160
= 0.5200
The answer is 135 degrees as 45 add 135 equals 180 degrees as it's a straight line
