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musickatia [10]
3 years ago
15

A corner shelf has a radius of 10.5 inches and represents 1/4 of a circle as shown.enter the area of the shelf in square inches.

round your answer to the nearest hundred

Mathematics
1 answer:
kaheart [24]3 years ago
6 0
Pie X r^2

Pie X 10.5^2 = 346.361

Answer divided by 4 as it’s only 1/4 of a circle = 86.59
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Check the picture below.

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A certain flight arrives on time 8484 percent of the time. Suppose 143143 flights are randomly selected. Use the normal approxim
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Answer:

a) P(x=108)=0.0020

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d) P(124≤x≤128)=0.1925

Step-by-step explanation:

We know the population proportion, that is p=0.84.

We take a sample of size n=143.

We will use the normal approximation to the binomial distribution to model this problem.

The mean and standard deviation of the normal approximation to the binomial distribution will be:

\mu=np=143*0.84=120.12\\\\\sigma=\sqrt{np(1-p)}=\sqrt{143*0.84*0.16}=\sqrt{19.22}=4.38

a) We have to calculate the probability that exactly 108 flights are on time.

As the normal distribution considers the random variable to be continous, we have to apply the continuity correction factor.

In this case, the probability of 108 flights on time can be calculated as P(107.5<x<108.5):

P(x=108)=P(107.5

b) Now we have to calculate that at least 108 flights are on time.

As the probability includes 108, the continuity factor will indicates that we calculate P(x>107.5). The z-value for x=107.5 has been already calculated in point a:

P(x\geq108)=P(x>107.5)=P(z>-2.88)=0.9980

c) We have to calculate the probability that fewer than 124 flights are on time. According to the continuity factor, we have to calculate the probability P(x<123.5), as the flight number 124 is not included in the interval.

P(x

d) We have to calculate the probability that between 124 and 128 flights, inclusive, are on time.

This interval corresponds to the probability P(123.5<x<128.5)

P(123.5

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Suppose John found his longitude to be 90.721°. What is this measure in degrees, minutes, and seconds? If needed, round your sec
nevsk [136]

Answer: 90 degrees, 43 minutes, 16 seconds

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Jamie is trying to work out the surface area of the cuboid below. Spot any mistakes and write the correct answer.
umka21 [38]

Step-by-step explanation:

The dimensions of the cuboid are 5 cm, 7 cm and 9 cm.

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A=2(lb+bh+hl)

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Jamie forgets to multiply 143 by 2 as the formula for surface area contains 2 as well.

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