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11111nata11111 [884]

3 years ago

10

50 people are selected randomly from a certain population and it is found that 12 people in the sample are over 6 feet tall. Wha

t proportion of people in the population is not over 6 ft tall?

1 answer:

Ket [755]3 years ago

8 0

12 out of 50 are over 6 feet (12/50)
Therefore 38 are under 6 feet (38/50)

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Temperatures this cold are rare.

zhannawk [14.2K]

Answer:

-32°F

Step-by-step explanation:

8°F - 40°F

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3 years ago

The lifetime of a certain brand of battery is known to have a standard deviation of 9 hours. Suppose that a random sample of 90

Rina8888 [55]

Answer:

lower limit : 36.44

upper limit : 39.56

Step-by-step explanation:

Given :

s = 9

n = 90

x = 38.9

Alpha, α = 0.10

∴ $z_{\alpha/2}=z_{0.05} = 1.645$

The confidence interval is :

$=x \pm\left(z_{\alpha /2} \times \frac{s}{\sqrt{n}}\right)$

$=38.9 \pm\left(1.645 \times \frac{9}{\sqrt{90}}\right)$

$=38.9 \pm 1.56$

$=(36.44, 39.56)$

Therefore,

lower limit : 36.44

upper limit : 39.56

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3 years ago

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Answer:

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Step-by-step explanation:

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3 years ago

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Answer:

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Step-by-step explanation:

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