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Using the z-distribution, a sample of 609 nickels has to be weighed.
<h3>What is a z-distribution confidence interval?</h3>The confidence interval is:
The margin of error is:
In which:
is the sample mean.
- z is the critical value.
- n is the sample size.
is the standard deviation for the population.
For this problem, the parameters are:
We solve for n to find the sample size, then:
n = 608.9
Rounding up, a sample of 609 nickels has to be weighed.
More can be learned about the z-distribution at brainly.com/question/25890103
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