Answer:
7
Step-by-step explanation:
Answer:
C. 6%
Step-by-step explanation:
You have to multiply 36 by A,B,C,D. Then add that number to 36.
First multiply all the options by the original price ($36)
A. 2.16% = 36 x 2.16% = 0.7776....this answer plus our original answer isn’t 38.16
B. 9.4% = 36 x 9.4% = 3.384....This answer plus 36 doesn’t equal 38.16
C. 6% = 36 x 6% = 2.16....2.16 plus 36 equals 38.16
D. 8% = 36 x 8% = 2.88....doesn’t equal 38.16 when added to 36.
Therefore 6% or C is the correct answer.
We are looking for the probability :

Transform the law to standard normal like this:

The above formula is equivalent to this one:

From normal law table, we read the value of

.

Solving the above equation for the score n:


, it is the score we are looking for.
In finding the value of this inequality first is to substitute the X to the F(x) so that it would be rearrange to get the value of k. So if 3<=x, K is directly proportional to X so it means that K >=3
Your answer would be A, B, and C.