Answer:
($47.245; $61.575)
Step-by-step explanation:
Mean sample repair cost (X) = $54.41
Standard deviation (s) = $28.89
Sample size (n) =44
Z-score for a 90% confidence interval (z) = 1.645
The confidence interval, assuming a normal distribution, is given by:

Applying the given data, the lower (L) and upper (U) bounds of the interval are:

The confidence interval is I = ($47.245; $61.575)
Answer: OPTION D.
Step-by-step explanation:
For this exercise it is important to remember the following Trigonometric Functions:

Knowing this, we can identify that:

Therefore, the ratio
is equivalent to this Trignometric function:

Answer:
A. 5xy + 9yz +3zx + 5x – 4y
Step-by-step explanation:
Because it is the "<u>Correct Answer</u>"
The unit price of Brand A pencil is 0.312 and unit price of Brand B pencil is 0.356. Brand A pencil is better to buy based on unit price
<u>Solution:</u>
Given that
Brand A has packed 24 pencils for 7.49
Brand B has packed 28 pencils for 9.97
Need to find the unit price of pencil for each brand.
For Brand A, price of 24 pencils = 7.49
So price of 1 pencil of brand A 
For Brand B, price of 28 pencils = 9.97
So price of 1 pencil of brand B 
As price if 1 pencil of brand A that is 0.312 is cheaper than 1 pencil of brand B that is 0.356
Hence good deal is to buy Brand A pencil
Answer:
wasd
Step-by-step explanation: