Answer:
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Step-by-step explanation:
My name not jeff
what the dog doin
Line a and b are perpendicular
Answer:
The sample size needed to be taken is approximately 74.
Step-by-step explanation:
To get alpha; we have 1 - 0.95 = 0.05
Therefore, 
The we look up z* in a Standard Normal table where α = 0.025 area in each tail.
From the table, z* = 1.96
From the question variance is 484, then the standard deviation is 22
Standard deviation = 
And margin of error is 5 or less
The formula for margin of error is given as:
margin of error = 

The approximate value of n is 74.
To solve this problem you must apply the proccedure shown below:
1. You have that
and
, therefore, you must divide must fucntion, as following:

2. You must simplify it,by factoring out
, as following:

3. Finally, you obtain that the answer is:

71 hours is the correct answer the first week is 7x8 which is 56 then 5x3 which is 15 and 56 to 15 and get your final answer of 71 hours.