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Mumz [18]
3 years ago
6

Four cards numbered 1,5,8, and 9 are placed in a bag. A card is drawn at random and then replaced. The card is drawn at random a

gain. What is the probability that both cards drawn have the number 9?
A. 1/16
B. 1/9
C. 1/4
D. 1/2
WILL MARK BRAINLIEST
Mathematics
2 answers:
anzhelika [568]3 years ago
8 0

Answer: D

Step-by-step explanation:

so we know the probability of drawing a 9 is 25 percent  or 1/4 because 9 is only one and doesn't repeat.

So the cards we drawn cards we drawn 2 times so multiply 1/4 times two.

1/4 * 2/1= 2/4 = 1/2

Law Incorporation [45]3 years ago
3 0

Answer:

The answer is D. 1/2 I'm pretty sure. I'm usually pretty good at probability. Keep in mind this may be wrong.

Step-by-step explanation:

There is a 1/4 chance that ONE card drawn will have the number nine. That is only for one though. For 2 cards, it would be a 2/4 chance. Since it is not one of the answers, do the next best thing and simplify the probability. Divide 2/4 by 2 and it equals 1/2.

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If z = -1.3, mu=80, sigma=30 What is the actual data value? Round to 2 decimal places.
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Step-by-step explanation: This simple confidence interval calculator uses a Z statistic and sample mean (M) to generate an interval estimate of a population mean (μ).

Note: You should only use this calculator if (a) your sample size is 30 or greater; and/or (b) you know the population standard deviation (σ), and use this instead of your sample's standard deviation (an unusual situation). If your data does not meet these requirements, consider using the t statistic to generate a confidence interval.

where:

M = sample mean

Z = Z statistic determined by confidence level

sM = standard error = √(s2/n)

As you can see, to perform this calculation you need to know your sample mean, the number of items in your sample, and your sample's standard deviation (or population's standard deviation if your sample size is smaller than 30). (If you need to calculate mean and standard deviation from a set of raw scores, you can do so using our descriptive statistics tools.)

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What is the slope of the line that passes through the points (-10, 9)(−10,9) and (-12, 7) ?(−12,7)
MAVERICK [17]

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Step-by-step explanation:

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7 0
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PLEASE HELP!!! 30 POINTS!!!!
nirvana33 [79]

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7 0
2 years ago
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C is the point on the line y = 2x + 1 where x = 2<br> Find the co-ordinates of the mid-point of BC.
inysia [295]

Based on the calculations, the coordinates of the mid-point of BC are (1, 4).

<h3>How to determine coordinates of the mid-point of BC?</h3>

First of all, we would determine the initial y-coordinate by substituting the value of x into the equation of line that is given:

At the origin x₁ = 0, we have:

y = 2x + 1

y₁ = 2(0) + 1

y₁ = 2 + 1

y₁ = 3.

When x₂ = 2, we have:

y = 2x + 1

y₂ = 2(2) + 1

y₂ = 4 + 1

y₂ = 5.

In order to determine the midpoint of a line segment with two (2) coordinates or endpoints, we would add each point together and divide by two (2).

Midpoint on x-coordinate is given by:

Midpoint = (x₁ + x₂)/2

Midpoint = (0 + 2)/2

Midpoint = 2/2

Midpoint = 1.

Midpoint on y-coordinate is given by:

Midpoint = (y₁ + y₂)/2

Midpoint = (3 + 5)/2

Midpoint = 8/2

Midpoint = 4.

Therefore, the coordinates of the mid-point of BC are (1, 4).

Read more on midpoint here: brainly.com/question/4078053

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7 0
1 year ago
Question 4 of 9<br> (7 + 1) + 8 = 7+ (1 + 8)<br> A. True<br> B. False
IgorC [24]

Answer:

A true

Step-by-step explanation:

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