Daniela bought a car for $24,000. Each year the value of the car decreases by $1750. B when daniela sells her car she wants to g
1 answer:
ANSWER
Find out the how many years can she keep the car.
To proof
As given
Daniela bought a car for $24,000
Each year the value of the car decreases by $1750.
let us assume that the number of years be x.
when daniela sells her car she wants to get at least 10,000 for it.
Than the inequality becomes in the form
24000 - 1750 x ≤ 10000
solve
1750x ≤ 14000
x ≤ 8 years
she keeps the cars 8 years .
Hence proved
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Answer:
We need at least 243 stores.
Step-by-step explanation:
In a sample with a number n of people surveyed with a probability of a success of , and a confidence level of
, we have the following confidence interval of proportions.
In which
z is the zscore that has a pvalue of .
The margin of error of the interval is:
For this problem, we have that:
95% confidence level
So , z is the value of Z that has a pvalue of
, so
.
Determine the number of stores that must be sampled in order to estimate the true proportion to within 0.04 with 95% confidence using the large-sample method.
We need at least n stores.
n is found when M = 0.04. So
Rounding up
We need at least 243 stores.