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Lelechka [254]
4 years ago
14

A trade magazine routinely checks the​ drive-through service times of​ fast-food restaurants. An 80​% confidence interval that r

esults from examining 576 customers in one​ fast-food chain's​ drive-through has a lower bound of 178.0 seconds and an upper bound of 181.0 seconds. What does this​ mean?
Mathematics
2 answers:
Aleksandr [31]4 years ago
5 0

Answer:

This means that we are 80% confident that the mean of the drive-through service time is between 178.0 seconds and 181.0 seconds. This conclusion was obtained after examined 576 customers. If you want a greater % of confidence you will have to lower the lower bound and increase the upper bound

Rom4ik [11]4 years ago
5 0

Answer:

This means that we are 80% confident that the mean drive- through service time of fast food service is between 178.0 seconds and 181.0 seconds

Step-by-step explanation:

A confidence Interval tells us that where the true value of parameter lies with certain confidence, It has a lower limit and an upper limit in this case it means with a confidence of 80% the mean drive- through service time of fast food service is between 178.0 seconds and 181.0 seconds  

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GaryK [48]

Answer:

[-5, 4) ∪ (4, ∞)

Step-by-step explanation:

Given functions:

f(x)=\dfrac{1}{x-3}

g(x)=\sqrt{x+5}

Composite function:

\begin{aligned}(f\:o\:g)(x)&=f[g(x)]\\ & =\dfrac{1}{\sqrt{x+5}-3} \end{aligned}

Domain: input values (x-values)

For (f\:o\:g)(x) to be defined:

x+5\geq 0 \implies x\geq -5

\sqrt{x+5}\neq 3 \implies x\neq 4

Therefore, -5\leq x < 4  and  x > 4

⇒  [-5, 4) ∪ (4, ∞)

3 0
2 years ago
. mrs. opsahl drove 399 miles on 14 gallons of gas. how many miles per gallon did her car get? 0.27 miles per gallon 28.5 miles
Dennis_Churaev [7]

Answer:

28.5 miles per gallon

Step-by-step explanation:

399 miles / 14 gallons

= 28.5 miles/1 gallon

1 gallon per 28.5 miles

8 0
2 years ago
jasmine took a cab home from her office. the cab charged a flat fee of $4, plus $2 per mile. Jasmine paid $32 for the trip. How
kykrilka [37]
Well if the flat fee is $4 and you pay $2 per mile and she spent a total of $32, the answer would have to be 14 miles

3 0
4 years ago
Read 2 more answers
Need help please anyone ?
Tresset [83]

Answer:

The mean would be 14.4 hours.

Step-by-step explanation:

In order to find the mean, or average, of the numbers, you would add all the numbers together.

17 + 15 +14 + 14 + 12 which equals 72

Then, you take the total which is 72, and divide it by how many numbers you added together which is 5.

72/5 = 14.4

5 0
3 years ago
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I know that is easy but to hard for me i am 9 th
weqwewe [10]
Oh okay then.,,,,,..,.,.,.,.,,,.,

6 0
3 years ago
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