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Komok [63]
3 years ago
11

A bag contains 7 red, 3 green, 4 blue, and 6 yellow marbles. Find the probability of randomly selecting a red marble three times

in a row if the first marble is replaced each time.
A;1225


B;1.05


C;.0429


D;.3535
Mathematics
1 answer:
77julia77 [94]3 years ago
8 0

Answer:

B

Step-by-step explanation:

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Ellen read a book a day for 10 weeks. How many books did<br> she read in all?
a_sh-v [17]

1 week = 7 days

10 weeks = 10×7 days

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Therefore,

1 day = 1 book

70 days = 70×1

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Thus Ellen reads 70 books in 10 weeks.

Hope helps

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1 year ago
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How many inches and does a window
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Use technology or a z-score table to answer the question.
Alik [6]

Answer:

The second choice: Approximately 65.2\% of the pretzel bags here will contain between 225 and 245 pretzels.

Step-by-step explanation:

This explanation uses a z-score table where each z entry has two decimal places.

Let \mu represent the mean of a normal distribution of variable X. Let \sigma be the standard deviation of the distribution. The z-score for the observation x would be:

\displaystyle z = \frac{x - \mu}{\sigma}.

In this question,

  • \mu = 240.
  • \sigma = 9.3.

Calculate the z-score for x_1 = 225 and x_2 = 245. Keep in mind that each entry in the z-score table here has two decimal places. Hence, round the results below so that each contains at least two decimal places.

\begin{aligned} z_1 &= \frac{x_1 - \mu}{\sigma} \\ &= \frac{225 - 240}{9.3} \approx -1.61\end{aligned}.

\begin{aligned} z_2 &= \frac{x_2 - \mu}{\sigma} \\ &= \frac{245 - 240}{9.3} \approx 0.54\end{aligned}.

The question is asking for the probability P(225 \le X \le 245) (where X is between two values.) In this case, that's the same as P(-1.61 \le Z \le 0.54).

Keep in mind that the probabilities on many z-table correspond to probability of P(Z \le z) (where Z is no greater than one value.) Therefore, apply the identity P(z_1 \le Z \le z_2) = P(Z \le z_2) - P(Z \le z_1) to rewrite P(-1.61 \le Z \le 0.54) as the difference between two probabilities:

P(-1.61 \le Z \le 0.54) = P(Z \le 0.54) - P(Z \le -1.61).

Look up the z-table for P(Z \le 0.54) and P(Z \le -1.61):

  • P(Z \le 0.54)\approx 0.70540.
  • P(Z \le -1.61) \approx 0.05370.

\begin{aligned}& P(225 \le X \le 245) \\ &= P\left(\frac{225 - 240}{9.3} \le Z \le \frac{245 - 240}{9.3}\right)\\&\approx P(-1.61 \le Z \le 0.54) \\ &= P(Z \le 0.54) - P(Z \le -1.61)\\ &\approx 0.70540 - 0.05370 \\& \approx 0.65.2 \\ &= 65.2\% \end{aligned}.

3 0
3 years ago
Elijah is ordering a taxi from an online taxi service. The taxi charges $2
tigry1 [53]
So there’s a flat fee of 2 and that’s like a standalone thing so our equation would be
2 + 1.50m

Assuming m = 9, it would be 2 + 13.50

And the two answers are-

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B) 2 + 1.50m
5 0
3 years ago
Y+ 2 = -8<br><img src="https://tex.z-dn.net/?f=%20%20%5Cfrac%7By%7D%7B5%7D%20%2B%202%20%3D%20%20-%208" id="TexFormula1" title="
yKpoI14uk [10]

Answer:2

Step-by-step explanation:

idek

6 0
3 years ago
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