Answer:
The ratio of the number of dogs to the total number of dogs and cats in the veterinarian's office is 9:16.
Step-by-step explanation:
Ratio:
The ratio of a to b is given by:
The ratio of dogs to cats in a veterinarian's office is 9:7.
This means that for each 9 dogs, there are 7 cars.
What is the ratio of the number of dogs to the total number of dogs and cats in the veterinarian's office?
9 dogs
9 + 7 = 16 dogs and cats. So
The ratio of the number of dogs to the total number of dogs and cats in the veterinarian's office is 9:16.
Mean is and a standard deviation is
, then the variable
.
Use substitution
.
This substitution gives you that .
a. For X=130, and
(the decimal value is taken from the Standard Normal Distribution Table).
b. For X=90, and for X=110,
. Then
(the decimal value is taken from the Standard Normal Distribution Table).