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3 years ago

Help? :)

Mathematics

2 answers:

snow_tiger [21]3 years ago

7 0

Answer:

Step-by-step explanation:

Because he replaced the bulbs it is still the same fraction 7/22 you then multiply it twice cause it is the same possibility of getting orange.

horsena [70]3 years ago

3 0

Answer:

7 over 22 multiplied by 7 over 22 equal 49 over 484

Step-by-step explanation:

There are 22 bulbs in the box.

The probability that he got an orange on the first draw is

P (orange) = orange/ total

= 7/22

He puts the bulb back so there are still 22 bulbs in the box

The probability that he got an orange on the second draw is

P (orange) = orange/ total

= 7/22

To find the probability that he got orange, orange

P (orange, orange) = 7/22 * 7/22

=49/484

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What is the solution to the system of equations?

Minchanka [31]

Answer:

(1, –5)

Step-by-step explanation:

It is relatively easy to try the offered solutions to see what works.

(1, -5)

3(1) +10(-5) = -47 . . . true

5(1) -7(-5) = 40 . . . true

(1, -5) is the solution

_____

As a check, you can try some of the other choices:

(1, 5)

3(1) +10(5) ≠ -47

(-1, -5)

3(-1) +10(-5) ≠ -47

(-1, 5)

3(-1) +10(5) ≠ -47

None of the other choices works in the first equation, so they're not the solution.

4 0

3 years ago

A human resource manager wants to see if there is a difference in the proportion of minority applicants who get the job and the

mash [69]

Answer:

Error Bound = 0.04

Step-by-step explanation:

Whenever we want to estimate parameter from a subset (or sample) of the population, we need to considerate that your estimation won't be a 100% precise, in other words, the process will have a random component that prevents us from always making the exact decision.

With that in mind, the objective of a confidence interval is to give us a better insight of where we expect to find the "true" value of the parameter with a certain degree of certainty.

The estivamative of the true difference between proportions was -0.19 and the confidence interval was [-0.23 ; -0.15].

The question also defines the error bound, as the right endpoint of the confidence interval minus the sample mean difference, so it's pretty straight foward:

Error Bound = $-0.15 -(-0.19) = -0.15 + 0.19 = 0.04$

The interpretation of this would be that we expect that the estimative for the difference of proportions would deviate from the "true" difference about $\pm 0.04$ or 4%.