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ahrayia [7]
3 years ago
8

in a bag of containing 32 white marbels, 18 blue marbels and 10 red marbels , if it take one randomly , change of getting the bl

ue marbels is
Mathematics
2 answers:
Ilia_Sergeevich [38]3 years ago
8 0
18/60 which is equal to 3/10

So you just need to put it into proportions which is blue to total. The total is 60 and there is 18 blue. Then you only need to simplify.
fenix001 [56]3 years ago
7 0
Change or chance?

To find the probability/chance of getting the blue marbles is:-

probability = \frac{number \: of \: blue \: marbles}{total \: of \: all \: marbles}

From the question, we have:-
Number of blue marbles : 18
Total of all marbles : 32 + 18 + 10 = 60

Thus,
probability = \frac{18}{60} \\ probability = \frac{3}{10}
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Which statement is not always true?
earnstyle [38]
A. True. Summing any rational number with an irrational number leads to an irrational result. The proof is a bit lengthy so I'm leaving it out. 

B. True. Adding p/q with r/s leads to (ps+qr)/(qs) which is rational. Keep in mind that q and s cannot be zero.

C. False. One counter example is sqrt(3)*sqrt(12) = sqrt(3*12) = sqrt(36) = 6. This shows the product of two irrational numbers, in this case sqrt(3) and sqrt(12), multiplying to get a rational result 6 = 6/1.

D. True. Multiplying p/q and r/s leads to (p*r)/(q*s) which is rational. Keep in mind that q and s cannot be zero.

----------------------------------------------------------------------

The final answer is choice C
6 0
3 years ago
Use technology to construct an appropriate model of the data. (0,1), (1,-2), (2,-3), (3,-2), (4,1) f(x) = – x2 + 4 f(x) = x2 - 4
Nadusha1986 [10]
The tool I used for modellin is MS Excel. As you on the left side of the picture, I tabulate the x and y coordinates with respect to their columns. Then, I plotted it using the scatter plot graph. In this type of graph, only plots are drawn on the Cartesian plane. Next, I created a trendline as represented by the blue dashed line. There are options to the degree of your trendline: linear, polynomial or exponential. The closes fit is the polynomial with a degree of 2. An option is listed there in displaying the equation. The equation modelled by regression through data fitting is:
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8 0
3 years ago
Read 2 more answers
The marketing director of a large department store wants to estimate the average number of customers who enter the store every f
Dahasolnce [82]

Answer:

36.5674\leq x'\leq61.4326

Step-by-step explanation:

If we assume that the number of arrivals is normally distributed and we don't know the population standard deviation, we can calculated a 95% confidence interval to estimate the mean value as:

x-t_{\alpha /2}\frac{s}{\sqrt{n} } \leq x'\leq x-t_{\alpha /2}\frac{s}{\sqrt{n} }

where x' is the population mean value, x is the sample mean value, s is the sample standard deviation, n is the size of the sample, \alpha is equal to 0.05 (it is calculated as: 1 - 0.95) and  t_{\alpha /2} is the t value with n-1 degrees of freedom that let a probability of \alpha/2 on the right tail.

So, replacing the mean of the sample by 49, the standard deviation of the sample by 17.38, n by 10 and t_{\alpha /2} by 2.2621 we get:

49-2.2621\frac{17.38}{\sqrt{10} } \leq x'\leq 49+2.2621\frac{17.38}{\sqrt{10} }\\49-12.4326\leq x'\leq 49+12.4326\\36.5674\leq x'\leq61.4326

Finally, the interval values that she get is:

36.5674\leq x'\leq61.4326

8 0
3 years ago
-
nexus9112 [7]

Answer:

its easy

Step-by-step explanation:

4 0
3 years ago
What is the answer A B C or D
Levart [38]
I think the answers is b
3 0
4 years ago
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