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creativ13 [48]
4 years ago
15

2. A researcher collected data about the favorite car color of a particular population. He asked 250 people about their favorite

vehicle color and the survey revealed the following: 32% of people said blue, 24% of people said white, 20% of people said red, 18% of people said black, and 4% of people said silver.
(a) How many people said their favorite vehicle color was red? Explain.
(b) How many more people said their favorite vehicle color was blue compared to those who said white? Explain.
(c) How many people said their favorite vehicle color was either black or silver? Explain.
Answer:
Mathematics
1 answer:
lubasha [3.4K]4 years ago
8 0
A) 55 people said their favorite vehicle color is red

B) 80 people said their favorite vehicle color was blue while 60 people said their favorite vehicle color was white

C) 45 said their favorite vehicle color was black while 10 people said their favorite vehicle color was silver
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Answer:

The mean for the sample mean distribution is 297 minutes.

Step-by-step explanation:

The Central Limit Theorem estabilishes that, for a random variable X, with mean \mu and standard deviation \sigma, a large sample size can be approximated to a normal distribution with mean \mu and standard deviation \frac{\sigma}{\sqrt{n}}.

Using the Central Limit Theorem for Means, what is the mean for the sample mean distribution?

The mean is the same as the population mean, that is, 297 minutes.

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4 years ago
Write an expression that gives the area of the shaded region in the figure.
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That is the second choice.
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3 years ago
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Answer:

1) 1.1 seconds

2) 13.5 feet

<h3>Part A</h3>

\rightarrow \sf  -16t^2 + 5t + 15 = 0

<u>Apply quadratic formula</u>:

\rightarrow \sf t=   \dfrac{-5\pm \sqrt{5^2-4\left(-16\right)\cdot \:15}}{2\left(-16\right)}

<u>Simplify following</u>

\rightarrow \sf t=-\dfrac{-5+\sqrt{985}}{32},\:t=\dfrac{5+\sqrt{985}}{32}

In decimal form:

\rightarrow \sf t=-0.825 ,\:t=1.137

Conclusion:

As time is be only positive: t = 1.1 seconds

<h3>Part B</h3>

\rightarrow \sf  h=-16t^2 + 5t + 15

<u>insert t = 0.5</u>

\rightarrow \sf  h=-16(0.5)^2 + 5(0.5) + 15

<u>simplify</u>

\rightarrow \sf  h=13.5

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3 years ago
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Which side lengths form a right triangle?
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Answer:

8, 15, 17  and \sqrt{2} , \sqrt{2}, 2

Step-by-step explanation:

c=\sqrt{a^2+b^2}

33=/=\sqrt{5^2+\sqrt{8}^2 }

17=\sqrt{8^2+15^2}

2=\sqrt{\sqrt{2}^2+\sqrt{2}^2  }

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