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USPshnik [31]
3 years ago
9

A 7th-grade class has 9 boys and 11 girls. Two representatives are to be chosen at random by their teacher. What is the probabil

ity that that BOTH representatives will be girls? Give your answer as a fraction is simplest form.
Mathematics
2 answers:
Vlad1618 [11]3 years ago
6 0

Answer:

Probability of choosing first girl = 11/20

Next one would be 10/19

11/20 x 10/19 = 11/38

Probability = 11/38

melisa1 [442]3 years ago
6 0
The probability would be be 11/38
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Negative six x plus seven is greater than or equal to nineteen
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It is false.

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3 years ago
Alice has 3 times the number of stamps that Doris does and Jane has 7 stamps more than Doris does. If Alice, Doris, and Jane eac
NeTakaya

Answer:

Only C

Step-by-step explanation:

A = 3D

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A: Alice doesn't necceserily have more stamps than Jane ( Jane could have 8 + 4 = 12 stamps, and Alice would have 3 + 4 = 7) (This is false)

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4 years ago
Which equation has a graph parallel to the graph of 9x + 3y = –22 ?
sweet-ann [11.9K]
An equation which has a graph that is parallel to the equation <span>9x + 3y = –22 should have the same slope as the given equation which is 3. Parallel lines are lines that do not meet or intersect at any point. They are characterized by having the same slope. For this case, any equation which has the slope of 3 will be parallel to the equation.</span>
6 0
3 years ago
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One of your employees has suggested that your company develop a new product. You decide to take a random sample of your customer
iren [92.7K]

Answer:

269

Step-by-step explanation:

The margin of Error is E = 0.05

The level of significance is, α = 1 - confidence level = 1 - 0.9 = 0.1

Assume that the proportion is, p =0.5

From the standard normal table, observe that the critical value of Z for two tail test and 10% level of significance is 1.64

The calculation of sample size is as follows: n = (Z/E)²p(1-p)

n = (1.64/0.05)²0.5 (1 - 0.5)

n = (1.64/0.05)² 0.25

n = 1075.84 × 0.25

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The required sample size with the given margin of error approximately is 269. This value indicates the size of the customers who are using this company’s products.

6 0
3 years ago
Pls help math need help
Elena-2011 [213]

Answer:

C

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Student 2 made an error with the distributive property.

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1 year ago
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