Answer:
A. 78%
B. 1.92%
Step-by-step explanation:
Given the information:
- 85% of all batteries produced are good
- The inspector correctly classifies the battery 90%
A. What percentage of the batteries will be “classified as good”?
The percentage of batteries are not good is:
100% - 85% = 15% and of those 100-90 = 10% will be classified as good. Hence, we have:
= 0.85*0.9 + 0.15*0.1 = 0.78
= 78%
So 78% of the batteries will be “classified as good”
B. What is the probability that a battery is defective given that it was classified as good?
We will use the conditional probability formula in this situation:
where:
- P(A) is the probability of A happening. (A is classified as good) => P(A) = 78%
- P(B|A) is the probability of event B happening, given that A happened. (B classified as detective)
is the probability of both events happening =>
(5% of the batteries are not good. Of those, 100-90 = 10% will be classified as good)
We have:
=
= 0.0192 = 1.92%
Hence, 1.92% probability that a battery is defective given that it was classified as good
Answer:
7 years
Step-by-step explanation:
Given:
Principal P = 9300
Interest rate r = 13% = 0.13
Final amount F = 17,763
Since the problem does not state that it is a compounded interest, we will assume this is a simple interest case.
The formula for simple interest is;
Interest I = Prt .....1
t = period
Final amount F = P + I
I = F-P
Substituting into equation 1;
(F-P) = Prt
t = (F-P)/Pr
Substituting the given values;
t = (17,763 - 9300)/(9300×0.13)
t = 7 years
Period = 7 years
Answer:
The change in the standard of living, measured by growth in real GDP per person, is 0.1356%
Step-by-step explanation:
Given,
In the current year,
Population = 31.5 million,
Real GDP = $814 million,
So, the real GDP per person =
≈ 25.841
In the previous year,
Population = 31 million,
Real GDP = $800 million,
So, the real GDP per person =
≈ 25.806
Hence, change percentage = 



≈ 0.1356 %
Answer:A
Step-by-step explanation: