Answer:
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Step-by-step explanation:
Answer:
The speed of the jet in still air is 415 mph and the speed of the wind is 19 mph
Step-by-step explanation:
we know that
The speed is equal to divide the distance by the time
Let
x -----> the speed of the wind in miles per hour
y ----> the speed of the jet in still air in miles per hour
we know that
<em>With a tailwind</em>

----> equation A
<em>With a headwind</em>

----> equation B
solve the system of equations A and B by elimination
Adds equation A and equation B

<em>Find the value of x</em>



therefore
The speed of the jet in still air is 415 mph and the speed of the wind is 19 mph
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Answer:
See below for answers and explanations
Step-by-step explanation:
<u>Part A</u>
Assuming that conditions have been met for the interval, we use the formula
where
represents the sample mean,
represents the critical value,
represents the sample standard deviation, and
is the sample size.
The critical value of
for an 80% confidence level with degrees of freedom
is equivalent to 
Thus, we can compute the confidence interval:

Therefore, we are 80% confident that the true mean age of all customers is between 30.17 and 35.11 years.
<u>Part B</u>
The margin of error is 
Slot method
10 choices for 1st slot
9 for 2nd
8 for 3rd
10*9*8=720
720 ways