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3 years ago

last month you swam the 50-meter freestyle in 28.38 seconds. today you swam it in 27.33 seconds. what is your percent of change?

1 answer:

7 0

The distance is the same(50 meters). So we will operate only with numbers 28.38 and 27.33.
The difference is 28.38-27.33=1.05
So the percent of change is (1.05/28.38)*100%≈3.7%
The answer is 3.7%

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To help explain or predict the response variable in every regression study, we use one or more explanatory variables. These vari

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The correct answer is False.

Step-by-step explanation:

To help explain or predict the response variable in every regression study, we use one or more explanatory variables. These variables are also called response variables or dependent variables.

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3 years ago

Jamal works as an electrician’s apprentice. He rewired 4 electrical outlets in 1 1/2 hours. If he works at the same pace for 7.5

Anna35 [415]

Answer: 20 outlets.

Step-by-step explanation:

We know that Jamal rewired 4 electrical outlets in 1 1/2 hours. This time can be rewritten as a decimal:

$(1+\frac{1}{2})hours=1.5hours$

Then, if he works at the same pace for 7.5 hours you can calculate the number of outlets that he will rewire with:

$\frac{1.5}{4}=\frac{7.5}{x}$

Being "x" the number of outlets that Jamal will rewire.

Finally, you have to solve for "x":

$\frac{1.5}{4}=\frac{7.5}{x}\\\\x(\frac{1.5}{4})=7.5\\\\x=(7.5)(\frac{4}{1.5})\\\\x=20$

He will rewire 20 outlets.

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First, decide whether the distribution is a discrete probability distribution, then select the reason for making this decision.

Lyrx [107]

It is not a probability distribution, as the sum of the probabilities is more than 1, thus, the correct option is No, considering that:

c) Since the sum of the probabilities is not equal to 1.

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For the sequence $(x, P(X = x))$ representing a probability distribution, it is needed that:

All probabilities are between 0 and 1, that is, for all values of x, $0 \leq P(X = x) \leq 1$ .
The sum of all probabilities is 1, that is: $\sum_{i = 1}^n P(x_i) = 1$

In this problem, the sum of the probabilities is:

$\sum_{i = 1}^n P(x_i) = 0.39 + 0.69 + 0.12 = 1.20$

Sum is not 1, thus it is not a probability distribution, and the correct option is:

c) Since the sum of the probabilities is not equal to 1.

A similar problem is given at brainly.com/question/24858659

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3 years ago