Answer:
The standard deviation of car age is 2.17 years.
Step-by-step explanation:
The Empirical Rule states that, for a normally distributed random variable:
68% of the measures are within 1 standard deviation of the mean.
95% of the measures are within 2 standard deviation of the mean.
99.7% of the measures are within 3 standard deviations of the mean.
In this problem, we have that:
Mean = 7.5
(a) If 99.7% of the ages are between 1 year and 14 years, what is the standard deviation of car age?
This means that 1 is 3 standard deviations below the mean and 14 is 3 standard deviations above the mean.
So

I want to find 



The standard deviation of car age is 2.17 years.
Answer:

Explanation:
The number of different ways in which the<em> two armadillos</em> would be at the ends of the row is 2:

The number of different combinations in which<em> two of the three aardvarks </em>can sit at the ends of the row is P(3,2):

Therefore, there are 2 + 6 = 8 different ways in which the two animlas on the ends of the row were both armadillos or both aardvarks.
Now calculate the total number of different ways in which the animals can sit. It is P(5,5):

Thus, <em>the probability that the two animals on the ends of the row were both armadillos or both aardvarks</em> is equal to the number of favorable outputs divided by the total number of possible outputs:

Answer:
Paula get
and Kawai get
.
Step-by-step explanation:
Given: Paula and Kawai shared
in the ratio of
.
To find: How much money did each person get?
Solution:
We have,
Paula and Kawai shared
in the ratio of
.
So, let Paula get
and Kawai get
.
As per the question,



Therefore, Paula get
, and Kawai get
.
Hence, Paula get
and Kawai get
.
Answer:
6x + 3.25y = 42.50
x + y = 8
Step-by-step explanation:
x is the amount of drinks, and y represents the amount of candies that are bought. The first equation is used to figure out the amount of candies and drinks needed to be bought to add up to 42.50, and the second equation is used to make sure that the quantity of drinks and candies add up to 8.