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Lyrx [107]
3 years ago
7

Suppose average pizza delivery times are normally distributed with an unknown population mean and a population standard deviatio

n of six minutes. A random sample of 28 pizza delivery restaurants is taken and has a sample mean delivery time of 36 minutes. Find a 90% confidence interval estimate for the population mean delivery time.
Mathematics
1 answer:
natta225 [31]3 years ago
5 0

Answer:

90% confidence interval = (34.069,37.931)  

Step-by-step explanation:

90% 1.645

 Xbar / Point Est. 36

 µ 0

σ 6

n 28

Confidence Interval  

 (34.069,37.931)  

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Solve for x…………………………..
Georgia [21]

Answer:

15x + 15° = 3x + 9° + 78° (exterior angle is equal to the sum of the opposite interior angles)

15x - 3x = 9° + 78° - 15 °

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6 0
3 years ago
For your job you need to track the amount of time you spend on each project and your total time. For Project A, you spend 1 hour
Veronika [31]

Answer:

  130 minutes

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130 minutes were spent on the two projects combined.

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8 0
3 years ago
Steve can clean 9 cars in 3 3/4 hours how many cars per hour?
kondaur [170]

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7 0
3 years ago
Suppose a ski jumper is 2,650 feet from the base of a ski jump and looks up to the top at an angle of elevation of 26 degrees. A
yuradex [85]
We can draw a right triangle to easily visualize the given problem. Since the ski jumper is 2650 ft from the base of the ski jump, we can consider this as one of the right triangle's legs. 

What we're looking for is the height of the ski jump or the other leg of the right triangle. Since the ski jumper looks up at an angle of elevation of 26°, we can use the tangent function to find the missing height. You may refer to the image below to better understand the problem. 

Recall that tanθ = (opposite side facing the angle)/(side adjacent to the angle). For this case, we have

\tan26= \frac{x}{2650}\\2650(\tan26) = x\\x \approx1292.49

Hence, the height of the ski jump (rounded off the nearest whole foot) is 1292 feet. 

Answer: 1292 feet

4 0
4 years ago
Compare the decimals 356.72 and 356.27. Which decimal has the greater value?
DiKsa [7]
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