No clue how to do this

Mathematics

1 answer:

andreev551 [17]3 years ago

7 0

B is your awnser! sorry if im wrong my calc shows its without a - symbol

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According to a study conducted by an organization, the proportion of Americans who were afraid to fly in 2006 was 0.10. A rando

jeyben [28]

Answer:

Event is not unusual(p>0.05).

Step-by-step explanation:

Given that :

$p=0.10\\\\n=1100\\\\x=121$

#The sample proportion is calculated as:

$\hat p=\frac{x}{n}\\\\=\frac{121}{1100}\\\\=0.1100$

#Mathematically, the z-value is the value decreased by the mean then divided the standard deviation :

$z=\frac{\hat p- p}{\sqrt{\frac{p(1-p)}{n}}}\\\\\\\\=\frac{0.11-0.10}{\sqrt{\frac{0.10(1-0.10)}{1100}}}\\\\\\=1.1055$

#We use the normal probability table to determine the corresponding probability;

$P(X\geq 121)=P(Z>1.1055)\\\\=0.1314$

Hence, the probaility is more than 0.05, thus the event not unusual and thus this is not necessarily evidence that the proportion of Americans who are afraid to fly has increased.

8 0

3 years ago

Can anyone help with this?

Morgarella [4.7K]

Answer:

111 degrees

Step-by-step explanation:

the total degrees in a hexagon is 720 degrees.

the known angles add up to 379, so there is 341 degrees left.

angle KFE is 105 degrees because it adds up to 180 degrees with GFK.

angle LAD is 130 degrees because it adds up to 180 degrees with BAD.

130+105=230, so there is now 111 degrees left and that is angle x

5 0

3 years ago

The lifetimes of 10,000 watch batteries are normally distributed the mean lifetime is 500 days the standard deviation is 60 days

Lelu [443]

Given:
μ = 500 days, the population mean
σ = 60 days, the population standard deviation

Therefore
μ + σ = 560
μ - σ = 440
μ + 2σ = 620
μ - 2σ = 380
μ + 3σ = 680
μ - 3σ = 320

The figure shown below illustrates the normal distribution
About 68% of the total area lies in x = (μ-σ, μ+σ)
About 95% of the total area lies in x = (μ-2σ, μ+2σ)
About 99.7% of the total area lies in x = (μ-3σ, μ+3σ).