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Sedbober [7]
3 years ago
8

Rolff recently completed a book of 20 deduction puzzles. the scatterplot below shows the time it took rolff to solve a puzzle ve

rsus the number of clues it had. if a puzzle is selected at random from the book, what is the probability that it had fewer than six clues, took rolff fewer than 100 seconds to solve, or both?
Mathematics
1 answer:
vlada-n [284]3 years ago
6 0
I have the scatterplot in front of me, and what the question is asking is what is the probability of the dot chosen being in any of the three categories. They only leave out three dots, so the probability is 17/20 or 85%.
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What's 3.7 in a fraction
Dima020 [189]

Answer:

3 7/10


Hope that helped!

7 0
3 years ago
Read 2 more answers
What is the domain of the function on the graph?
Dennis_Churaev [7]

Answer:

All real numbers greater than or equal to -3

Step-by-step explanation:

First look at graph where the line points to which direction of the graph

And look for any closed or open circles in the graph

Since in the graph has a close circle at (-3,-2) meaning it includes that x-value for its domain.

With the graph going to positive infinity it states that the domain is all real numbers.

So in conclusion it has a domain of all real numbers greater than or equal to -3

5 0
3 years ago
Which inequality is graphed below
Vaselesa [24]

Answer:

3x-2y < 6

Step-by-step explanation:

First of all, we need to identify the equation of the line. x and y intercepts are known, so we can quickly write the line as

\frac x 2 + \frac y{(-3)} = 1 \rightarrow 3x-2y=6 That gives us the last two options. To solve it let's plug a convenient point - read: the origin - into the equation and see which one holds true. And since for obvious reason 3\cdot 0 -2 \cdot 0 =0 < 6 the valid solution is the last one.

6 0
2 years ago
Which expression has a value different from the others?
Alexxandr [17]

Answer:

I think B

Step-by-step explanation:

A. -108+105

-3

B. 9.9+(12.9)

22.8

C. -7 2/9 -(-4 2/9)

-3

D. 637 - 641

-4

Is the last one written wrong because if that one is 637-640 or 638-641 than it would equal -3. Then the answer would be B.

5 0
2 years ago
A researcher takes a simple random sample of 83 homes in a city and finds that the mean square footage is 1628 with a standard d
Anna [14]

Answer: (1583.63, 1672.37)

Step-by-step explanation:

Given : Sample size : n= 83

Sample mean : \overline{x}=1628

Sample standard deviation : \sigma=243

The population standard deviation(\sigma) is unknown .

The confidence interval for population mean :

\overline{x}\pm t_{\alpha/2}\dfrac{s}{\sqrt{n}}

For 90% confidence , significance level =\alpha=1-0.90=0.10

Using t-distribution table , Critical t-value = t_{(\alpha/2, n-1)}=t_{0.05,82}=1.6636

, where n-1 is the degree of freedom.

Now ,  90% confidence interval for the mean square footage of all the homes in that city will be :-

1628\pm (1.6636)\dfrac{243}{\sqrt{83}}\\\\ 1628\pm (1.6636)(26.672715)\\\\\\\\\approx1628\pm 44.37\\\\=(1628- 44.37,\ 1628+ 44.37)\\\\=(1583.63,\ 1672.37)

Hence, the 90% confidence interval for the mean square footage of all the homes in that city = (1583.63, 1672.37)

7 0
3 years ago
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