The ideal weight of a nickel is 0.176 ounce. To check that there are 40 nickels in a roll, a bank weighs the roll and allows for
1 answer:
Answer: Total weight will be 7.055 ounces.
Step-by-step explanation:
Since we have given that
Ideal weight of a nickel = 0.176 ounce
Number of nickels in a roll = 40
Total weight becomes
Error that was allowed in total weight = 0.015 ounce
So, Total weight will be
Hence, Total weight will be 7.055 ounces.
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Answer:
628
Step-by-step explanation:
We have the standard deviation of the sample, so we use the t-distribution to solve this question.
The first step to solve this problem is finding how many degrees of freedom, we have. This is the sample size subtracted by 1. So
df = 12 - 1 = 11
95% confidence interval
Now, we have to find a value of T, which is found looking at the t table, with 11 degrees of freedom(y-axis) and a confidence level of . So we have T = 2.2
The margin of error is:
In which s is the standard deviation of the sample and n is the size of the sample.
The lower end of the interval is the sample mean subtracted by M. So it is 665 - 37 = 628 hours.
The answer is 628