The table shows the number of computers per household in the
United States.
Computers
0
1
2
3
4
5
Number of households (in millions)
27
47
24
10
4
2
Construct a probability distribution.
Graph the probability distribution using a histogram and
describe its shape.
Find the mean, variance, and standard deviation of the
probability distribution and interpret the results.
Find the probability of randomly selecting a household that has
at least four computers.
Complete parts (a) and (b) below.
The number of dogs per household in a small town
(a) Find the mean, variance, and standard deviation of the
probability distribution.
Find the mean of the probability distribution.
u=___(Round to one decimal place if needed)
Find the variance of the probability distribution.
o2=___(round to one decimal place if needed)
find the standard deviation of the probability distribution
o=____(round to one decimal place when needed)
(b) Interpret the results in the context of the...
Complete parts (a) and (b) below. The number of dogs per
household in a small town
Dogs 0 1 2 3 4 5
Probability 0.649 0.220 0.087 0.024 0.013 0.008
(a) Find the mean, variance, and standard deviation of the
probability distribution.
A survey of ten households showed the following number of TV
sets per household.
1, 3, 2, 1, 1, 2, 0, 2, 1, 2
a. Find the mean, variance and standard deviation for this sample
of ten households
b. Construct a 95% confidence interval for the population mean
number of TV sets per household.
c. Test if the population mean number of TV sets per household is
2.
(2) A survey of households in a small town showed that in 500 of
2,000 sampled households, at least one member attended a town
meeting during the year. What is the 95% confidence interval for
the proportion of households represented at a town meeting?
exampleInput.txt
1 2 3
0 2 3 4
0 1 3 5
0 1 2 6
1 5 6 8
2 4 6 7
3 4 5 9 10
5 8 9
4 7 9
6 7 8
6
How can I detect when 'cin' starts reading from a new line. The
amount of numbers in each row is unknown. I need them in type 'int'
to use the data.
A researcher wishes to estimate the number of households with
two computers. How large a sample is needed in order to be 98%
confident that the sample proportion will not differ from the true
proportion by more than 4%? A previous study indicates that the
proportion of households with two computers is 25%.