Determine from the balanced chemical reaction ifthe derived mole ratio is correct or incorrect.

Answers

Answer 1

Answer:

It's incorrect. There are 6 moles of NaBr produced for every 3 moles of Na₂S among the reactants (as well as 2 moles of FeBr₃), so the mole ratio of NaBr to Na₂S should be 2 : 1, not 1 : 1.

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The skip interval in systematic random sampling is computed by dividing the number of potential sampling units on the list by the desired sample size .O True
O False

Answers

Answer:

True

Step-by-step explanation:

The skip interval in systematic random sampling is computed by dividing the number of potential sampling units on the list by the desired sample size .

Systematic sampling is a type of probability sampling method in which sample members from a larger population are selected according to a random starting point but with a fixed, periodic interval (the sampling interval).

Sampling interval is calculated by dividing the population size by the desired sample size

The weights of a certain brand of candies are normally distributed with a mean weight of 0.8547 g and a standard deviation of 0.0511 g. A sample of these candies came from a package containing 463 candies, and the package label stated that the net weight is 395.2 g. (If every package has 463 candies, the mean weight of the candies must exceed StartFraction 395.2 Over 463 EndFraction 395.2 463equals=0.8535 g for the net contents to weigh at least 395.2 g.) a. If 1 candy is randomly selected, find the probability that it weighs more than 0.8535 g. The probability is .(Round to four decimal places as needed.)

Answers

Answer:

There is a 69.15% probability that it weighs more than 0.8535 g.

Step-by-step explanation:

Problems of normally distributed samples can be solved using the z-score formula.

In a set with mean $\mu$ and standard deviation $\sigma$ , the zscore of a measure X is given by

$Z = (X - \mu)/(\sigma)$

After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X. Subtracting 1 by the pvalue, we This p-value is the probability that the value of the measure is greater than X.

In this problem, we have that

The weights of a certain brand of candies are normally distributed with a mean weight of 0.8547 g, so $\mu = 0.8547$ .

We have a sample of 463 candies, so we have to find the standard deviation of this sample to use in the place of $\sigma$ in the Z score formula. We can do this by the following formula:

$s = (\sigma)/(√(463)) = 0.0024$

Find the probability that it weighs more than 0.8535

This is 1 subtracted by the pvalue of Z when $X = 0.8535$

$Z = (X - \mu)/(s)$

$Z = (0.8535 - 0.8547)/(0.0024)$

$Z = -0.5$

$Z = -0.5$ has a pvalue of 0.3085.

This means that there is a 1-0.3085 = 0.6915 = 69.15% probability that it weighs more than 0.8535 g.

Find the area of shaded region

Answers

Answer:

180

Step-by-step explanation:

calculate the non shaded parts first:

[FBE]=60

[DAE]=40

[ABCD]=280

so if we were to subtract the non shaded parts from the total area, we would get the shaded region. therefore, the shaded region is 180

A study conducted to assist the impact of caffeine consumption, smoking, alchohol consumption, and physical activity on cardiovascular disease. Suppose that 40% of participants consume caffeine and smoke. If 8 participants are evaluated what is the probability that: A. Exactly half of them consume caffene and they smoke?

Answers

Answer:

8.4

Step-by-step explanation:

Math problems solve

Answers

what math problem do you need help with?

Which of the following is a like radical to 3 x StartRoot 5 EndRoot?x (RootIndex 3 StartRoot 5 EndRoot)
StartRoot 5 y EndRoot
3 (RootIndex 3 StartRoot 5 x EndRoot)
y StartRoot 5 EndRoot

Answers

Answer:

Step-by-step explanation:

Final answer:

The like radical to the expression 3√5 is y√5, as both expressions have the square root index and the same radicand, which is 5.

Explanation:

The student is asking which radical expression is like the radical 3√5. Like radicals have the same index and radicand. The index is the degree of the root, and the radicand is the number under the radical sign. The expression 3√5 means 3 times the square root of 5, or in exponential form, 3 × 51/2. The like radical for 3√5 would also need to have a square root (index of 2) and the same radicand (5). Therefore, the like radical to 3√5 from the options provided would be y√5 because it has the same index (2) and radicand (5), only with a different coefficient (y instead of 3).

Additionally, expressing radicals as fractional exponents helps to identify like radicals. For example, using the property x² = √x we can understand that if we have the same base and exponent, we can consider the expressions to be like radicals. Hence, in this case, since both 3 and y are just coefficients, the root parts √5 are the same, making them like radicals.

Learn more about Like Radicals here:

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