Answer:
Step-by-step explanation:
Let X be average interest paid monthly by a bank's Visa cardholders
Given that X is N(28, 8)
In the following to find out probability we convert X to z score and use std normal distribution table
Z = 
Probability being less than 1 is here equal to the proportion also.
A) P(X>32) = P(Z>0.5)=0.5-0.1915=0.3085
B) P(X>40) = P(Z>1)=0.5-0.3413=0.1687
C) P(X<19) = P(Z<-1.125)=0.5-0.0438=0.4562
D) We have to find 19th percentile here
Z =-0.88
Take -5x + y =13 and rearrange for y:
y=13+5x
Substitute into other equation for y:
-3x+3(13+5x)=3
Multiply out brackets:
-3x+39+15x=3
Simplify:
12x+39=3
Rearrange for x:
12x=-36
x=-3
Substitute back into y=13+5x:
y=13+5(-3)
y=13-15
y=-2
each sister gets 21 dollars, so there are three sisters there fore 21*3 equals 63
One way to solve this problem would be to find two points on the the line and subtract the y-values from each other (y-y/x-x). Then subtract the x-values from each other. Finally you should have this: y/x as your answer. It may be a fraction, but you also may be able to simplify it into a whole number. This is just how I solve these types of problems in class.
They are the same
You can write 0.50 as 0.5 because the 0 at the end doesn't really mean anything xxx hope it helps x
