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Archy [21]
3 years ago
8

An important factor in selling a residential property is the number of people who look through the home. A sample of 20 homes re

cently sold in the Buffalo, New York, area revealed the mean number looking through each home was 22 and the standard deviation of the sample was 7 people. Develop a 98 percent confidence interval for the population mean.

Mathematics
1 answer:
egoroff_w [7]3 years ago
7 0

Answer:

Step-by-step explanation:

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3 years ago
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Ally's tricycle has two different wheel sizes: one larger wheel and two smaller wheels. As Ally travels the distance between her
vazorg [7]

Answer:

500 inches

Step-by-step explanation:

Let C₁ and n₁ be the circumference and the number of rotations of the larger wheel. Also, let C₂ and n₂ be the circumference and the number of rotations of the smaller wheel. Since the distance moved by both wheels from Ally's house to her neighbor's house is the same, n₁C₁ = n₂C₂. (1)

Also it is given that half the circumference of the larger wheel is 5 inches more than the circumference of one of the smaller wheels.

So, C₁/2 = C₂ + 5

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Substituting C₁ into (1), we have

n₁C₁ = n₂C₂.

n₁[2(C₂ + 5)] = n₂C₂.

Since n₁ = 10 and n₂ = 25, we have

10[2(C₂ + 5)] = 25C₂

20(C₂ + 5) = 25C₂

expanding the bracket,

20C₂ + 100 = 25C₂

collecting like terms, we have

25C₂ - 20C₂ = 100

5C₂ = 100

dividing both sides by 5, we have

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So, the distance between Ally's house and her neighbor's house is d = n₂C₂ = 25(20)

= 500 inches

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2 years ago
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