The public library has volunteers shelve book after they have been returned.lisa shelve 165 book in 25 minutes.patricia shelves
1 answer:
Answer:
Lisa can shelve at least 6 books in 1 minute time.
<u>Explanation:</u>
Given:
The public library has volunteers shelve book after they have been returned.
Lisa shelve 165 book in 25 minutes.
Patricia shelves 198 books in 45 minutes.
To Find:
We have to find how many can Lisa shelve each minute?
Solution:
Now, we know that, number of books she can shelve =
Number of books she can shelve = = 6.6
Hence, she can shelve at least 6 books in 1 minute time.
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Answer:
The 99% confidence interval is (3.0493, 3.4907).
We are 99% sure that the true mean of the students Perry score is in the above interval.
Step-by-step explanation:
Our sample size is 21.
The first step to solve this problem is finding our degrees of freedom, that is, the sample size subtracted by 1. So
.
Then, we need to subtract one by the confidence level and divide by 2. So:
Now, we need our answers from both steps above to find a value T in the t-distribution table. So, with 20 and 0.005 in the two-sided t-distribution table, we have
Now, we find the standard deviation of the sample. This is the division of the standard deviation by the square root of the sample size. So
Now, we multiply T and s
Then
The lower end of the interval is the mean subtracted by M. So:
The upper end of the interval is the mean added to M. So:
The 99% confidence interval is (3.0493, 3.4907).
Interpretation:
We are 99% sure that the true mean of the students Perry score is in the above interval.
Answer:
The answer is:
12 ( y+ )
this suits perfectly the description