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Genrish500 [490]
3 years ago
9

A shipment of 12 microwave ovens contains three defective units. A vending company has ordered four units, and because each has

identical packaging, the selection will be random. What is the probability that (a) all four units are good, (b) exactly two units are good, and (c) at least two units are good?
Mathematics
1 answer:
statuscvo [17]3 years ago
8 0

Answer:a) 54/55

b) 100/110

c) 99/110

Step-by-step explanation:

a)Probability of ordering 4= 9/12×3/11×2/10×1/9 = 54/11880

Probability of 4 good units= 4 × 54/11880

= 216/11880

1/55

1-(1/55) = 54/55

b)Probability of 2 good units= 2 × 54/(11880)

= 108/11880

= 1/110

1- (1/110)= 100/110

c) Probability of exactly 2 units not good= 1 -(100/110) =99/110

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In the school band, there is 1 boy for every 5 girls. There is a total of 12 boys. How many girls are in the band?
Sophie [7]

Answer:

60

Step-by-step explanation:

5 times 12

4 0
3 years ago
If the area of the table is 36 inches by 24 inches, will they have enough tiles to cover the table? If not, how many more will t
Aliun [14]
How many tiles do they have?
36*24=864 If the amount of tiles they have is less than 864, subtract 864 by the amount of tiles.
8 0
3 years ago
Fran is training for a cycle race. In the first week, she cycles 195 miles. In the second week, she manages 243 miles. To the ne
AleksAgata [21]

Answer:

24.6%

Step-by-step explanation:

243-195=48

48/195=x/100

48 × 100

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4 0
2 years ago
Find the area of the shaded region. Express your answer in terms of pi
Likurg_2 [28]

Area of the shaded region is 540 – 65.25π.    

Solution:

Length of the rectangle = 12 + 9 + 6 + 3 = 30 in

Width of the rectangle = 18 in

Radius of the larger circle (r_1) = 12 ÷ 2 = 6 in

Radius of the medium circle (r_2) = 9 ÷ 2 = 4.5 in

Radius of the smaller circle (r_3) = 6 ÷ 2 = 3 in

Area of the shaded region = Area of the rectangle – Area of the larger circle – Area of the medium circle – Area of the smaller circle

                                   =l\times b-\pi r_1^2-\pi r_2^2-\pi r_3^2

                                   =30\times 18-\pi \times 6^2-\pi \times (4.5)^2-\pi \times 3^2

                                   =540-36\pi-20.25\pi-9\pi

                                   =540-65.25\pi

Area of the shaded region is 540 – 65.25π.    

4 0
3 years ago
Which of the following is an equivalent form of the compound inequality<img src="https://tex.z-dn.net/?f=%20%20-%2044%20%5C%20%2
Novay_Z [31]

Given the compound inequality:

-44>-2x-8⩾-8

Let's find the equivalent form of the inequality.

To find the equivalent form, let's simplify the inequality.

SInce it is a compund inequality, we are to seperate the inequalities.

Simplify the first two inequalities, then simplify the last two inequalities.

We have:

First two inequalities: -44 > -2x - 8

Last two inequalities: -2x - 8 ⩾ -8

Let's simplify both

\begin{gathered} -44>-2x-8 \\  \\ Rewrite\text{ the inequality and change the inequality sign:} \\ -2x-8\begin{gathered} \text{Second inequality:} \\ -2x-8⩾-8 \\  \end{gathered}

Therefore, the equivalent form is:

-2x-8

ANSWER:

d.\text{   -2x - 8

5 0
1 year ago
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