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2 years ago

9

a dolphin is swimming 18 feet below the surface of the ocean. there is a coast guard helicopter 75.5 feet above the surface of t

he water that is directly above the dolphin. what is the distance between the dolphin and the helicopter?

1 answer:

Sever21 [200]2 years ago

6 0

Answer:

93.5

Step-by-step explanation:

I think because u would take -18 -18 + 75.5.

can I have brainlist please.

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In Mona’s new video game she earns 30 points for each fish caught and 80 points for each octopus captured, but she loses 15 poin

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According to the Census Bureau, 3.36 people reside in the typical American household. A sample of 25 households in Arizona retir

Mila [183]

Answer:

We conclude that the mean number of residents in the retirement community household is less than 3.36 persons.

Step-by-step explanation:

We are given the following in the question:

Population mean, μ = 3.36

Sample mean, $\bar{x}$ = 2.71

Sample size, n = 25

Alpha, α = 0.10

Sample standard deviation, s = 1.10

First, we design the null and the alternate hypothesis

$H_{0}: \mu = 3.36\text{ residents per household}\\H_A: \mu < 3.36\text{ residents per household}$

We use One-tailed(left) t test to perform this hypothesis.

Formula:

$t_{stat} = \displaystyle\frac{\bar{x} - \mu}{\frac{s}{\sqrt{n}} }$ Putting all the values, we have

$t_{stat} = \displaystyle\frac{2.71 - 3.36}{\frac{1.10}{\sqrt{25}} } = -2.95$

Now, $t_{critical} \text{ at 0.10 level of significance, 24 degree of freedom } =-1.31$

Since,

$t_{stat} < t_{critical}$

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2 years ago

Solve -12 = Z - 3 for Z.

ladessa [460]

Answer:

The answer to Z is "-9". Sorry, I couldn't explain it but that's the answer. I hoped I helped.

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