The minimum number of times would be 5 times.
Answer:
The sample size required is at least 171
Step-by-step explanation:
We have that to find our
level, that is the subtraction of 1 by the confidence interval divided by 2. So:

Now, we have to find z in the Ztable as such z has a pvalue of
.
So it is z with a pvalue of
, so 
Now, find the margin of error M as such

In which
is the standard deviation of the population and n is the size of the sample.
What sample size is required?
A samle size of at least n is required, in which n is found when 
So






Rouding up
The sample size required is at least 171
Answer:
7x^2−2x−12
Step-by-step explanation:
hope this helps:)
Answer:
1503.37
Step-by-step explanation:
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87 ⇒ 90
34 ⇒ 30
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121 120