An electric company charges a certain rate per kilowatt-hour (\text{kWh})(kWh) of electricity used and an administrative fee of
2 answers:
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Answer:
Step-by-step explanation:
Starting from , we do
, which means
, which can be written as
, which gives us
, which we know is
, so our solutions are:
Which can be approximated to:
Answer:
Step-by-step explanation:
We know that,
where
r = number of successful trials = 122,
n = 328
p = proportion
From probability distribution we also know that,
for a 99% confidence level = 2.576
Marginal error will be,
Putting the values,
So the interval will be,