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ExtremeBDS [4]
3 years ago
7

A box contains 3 plain pencils and 9 pens. a second box contains 7 color pencils and 3 crayons. one item from each box is chosen

at random. what is the probability that a plain pencil from the first box and a color pencil from the second box are selected?
Mathematics
2 answers:
Norma-Jean [14]3 years ago
6 0
3 pencils and 9 pens = 12 total
probability of picking pencil in 1st box is 3/12 which reduces to 1/4

7 pencils and 3 crayons = 10 total
probability of picking pencil from 2nd box is 7/10

probability of both = (1/4 * 7/10) = 7/40 <==
SpyIntel [72]3 years ago
3 0
Out of the first box the possibility would be 3:12 or 3 out of 12. The second box would be 7:10 or 7 out of 10
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Answer:

Less than

Step-by-step explanation:

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3 years ago
The radius of a circle with an area of 60 square centimeters is represented by the expression √60/π centimeters. What is another
monitta

Answer:

r= 2 √(15/π)

Step-by-step explanation:

Given that :

Area of circle =60sq cm

radius=√60/π

Area=\pi r^2\\60=\pi r^2\\\\\sqrt{\frac{60}{\pi}}=r\\\\\sqrt{\frac{15\times 4}{\pi}}=r\\2\sqrt{\frac{15}{\pi}}=r

Hence the radius can be written as 2 √(15/π)

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3 years ago
Determine the ordered pair that satisfies the equation, 2x - 8y = -9.
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8 0
3 years ago
The following data are the distances between 20 retail stores and a large distribution center. The distances are in miles.
Free_Kalibri [48]

Answer:

1191.4 ; 34.5

Step-by-step explanation:

Given the data:

29; 37; 38; 40; 58; 67; 68; 69; 76; 86; 87; 95; 96; 96; 99; 106; 112; 127; 145; 150

The sample variance and standard deviation can be obtained thus :

Σ(X - m)² / (n - 1)

Where, m = mean of the sample

n = sample size

The standard deviation equals, sqrt(variance )

Using a calculator:

The variance, σ² ;

Mean = Σx / n = 1681 / 20 = 84.05

(x -m)^2

[(29-84.05)^2 + (37-84.05)^2 + (38-84.05)^2 + (40-84.05)^2 + (58-84.05)^2 + (67-84.05)^2 + (68-84.05)^2 + (69-84.05)^2 + (76-84.05)^2 + (86-84.05)^2 + (87-84.05)^2 + (95-84.05)^2 + (96-84.05)^2 + (96-84.05)^2 + (99-84.05)^2 + (106-84.05)^2 + (112-84.05)^2 + (127-84.05)^2 + (145-84.05)^2 + (150-84.05)^2] / 19

22636.95 / 19

= 1191.4184 = 1191.42

Standard deviation = sqrt( Variance)

Standard deviation = sqrt(1191.4184)

Standard deviation = 34.516929 = 34.52

4 0
3 years ago
Item 21
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Answer:

1st: 5x

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Step-by-step explanation:

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