emma has 15 cookies and eats 2 cookies per day evan has 45 cookies and eats 8 each day how would you write and solve an equation
2 answers:
Solution:
we are given that
Emma has 15 cookies and eats 2 cookies per day.
So the number of cookies left after n days can be written as
Evan has 45 cookies and eats 8 each day.
So the number of cookies left after n days can be written as
Number of days after which they will have equal number of cookies can be found as below
Hence both will have equal number of cookies after 5 days.
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Answer:
A sample of 16577 is required.
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 z-score that has a p-value of .
The margin of error is of:
99% confidence level
So , z is the value of Z that has a p-value of
, so
.
She wants to estimate the proportion using a 99% confidence interval with a margin of error of at most 0.01. How large a sample size would be required?
We have no estimation for the proportion, and thus we use , which is when the largest sample size will be needed.
The sample size is n for which M = 0.01. So
Rounding up:
A sample of 16577 is required.