Question

A frequency distribution is shown below.
The number of dogs per household in a small town.
Dogs,Households
0,1239
1,422
2,169
3,41
4,27
5,17
a. use the frequency distribution to construct a probability distribution
B. find the mean of the probability distribution
c. find the variance
d. find the standard deviation
e. interpret the results in the context of a real life situation
household on average has 0.9 dog with a standard deviation of 0.9 dog.
B. A household on average has 0.6 dog with a standard deviation of 0.9 dog.

Answer 1

A. household on average has 0.9 dog with a standard deviation of 0.9 dog.
B. A household on average has 0.6 dog with a standard deviation of 0.9 dog.
C. A household on average has 0.6 dog with a standard deviation of 17 dog.
D. A household on average has 0.9 dog with a standard deviation of 0.6 dog

Answer 2

please help omg my grade is riding on this :-(

Answer 3

so the probability distribution is just the relative frequency

1st add the total number of households in the survey

so add a column to the table and

then for 0 dogs its 1239/Total households write the answer as a decimal, maybe 3 decimal places

same for 1 dog 422/ total households....

repeat the process for the remainder of the table.

then you should be able to do the rest...

Answer 4

i already did that part
i neeed the variance and the standard deviation
and the probability distribution
:-(

Answer 5

well isn't the standard deviation

\[SD = \sqrt{n} \times p \times (1 - p)\]

perhaps this may help

http://www.mathsisfun.com/data/random-variables-mean-variance.html

Answer 6

forget it. thanks i guess.