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nevsk [136]
3 years ago
14

The probability that a person will have 0, 1, or 2 dental checkups per year is 0.3, 0.6, and 0.1, respectively. If seven people

are picked at random, what is the probability that two will have no checkups, four will have one checkup, and one will have two checkups in the next year?
A) 0.012
B) 0.122
C) 0.588
D) 0.018
Mathematics
1 answer:
Tom [10]3 years ago
3 0
<h2>The required probability is 0.1224.</h2>

Step-by-step explanation:

Here, given:

The probability of having 0 dental checkup = 0.3

The probability of having 1 dental checkup = 0.6

The probability of having 2 dental checkup = 0.1

Number of people chosen at random  = 7

So, the number of ways 2, 4 and 1 checkup are :  (\frac{7!}{2! \times 4!  \times 1!} )

Now, the combined probability  that two will have no checkups, four will have one checkup, and one will have two checkups in the next year

= (\frac{7!}{2! \times 4!  \times 1!} ) \times (0.3)^2 \times (0.6)^4 \times (0.1)^1  =  0.1224

Hence, the required probability is 0.1224.

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Answer:

an = a(n-1) +5

Step-by-step explanation:

8 0
3 years ago
The Smith family is designing new plans for an in-ground pool. Mr. Smith draws a rectangular shape with a length that is 5 feet
Vinil7 [7]
Answer:
total area = w^2 + 13w + 36 ft^2

Explanation:
The final pool and the sideways will be as shown in the attachment

1- We will get the area of the pool:
length of pool = w + 5
width of pool = w
area of pool = length * width
area of pool = w (w+5) square ft ...........> I

2- We will get the area of the sideways:
The side way is composed of the two blue rectangles and the two green ones
Therefore:
area of sideway = 2(area of blue rectangle) + 2(area of green rectangle)
a- getting the area of the blue rectangle:
length = w + 5 + 2 + 2 = w+9
width = 2
area of blue rectangle = length * width
area of blue rectangle = 2(w+9) square ft ..........> a
b- getting the area of the green rectangle:
length = w
width = 2
area of green rectangle = length * width
area of green rectangle = 2w square ft ..............> b
c- getting area of sideways:
as mentioned before:
area of sideways = 2(area of blue rectangle) + 2(area of green rectangle)
area of sideways = 2*equation a + 2*equation b
area of sideways = 2 (2(w+9)) + 2(2w)
area of sideways = 4(w+9) + 4w
area of sideways = 4w + 36 + 4w
area of sideways = 8w + 36 ...........> II

3- getting the total area:
total area = area of pool + area of sideways
total area = equation I + equation II
total area = w (w+5) + 8w + 36
total area = w^2 + 5w + 8w + 36
total area = w^2 + 13w + 36 ft^2

Hope this helps :)

3 0
3 years ago
Worth 50 Points!!
Naddika [18.5K]
Hello There!

These statements are not equal. If you solve them, you will not get the same value.

Hope This Helps You!
Good Luck :)
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2 years ago
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The answer is larger in volume because the come is holow in the inside and that square pyrimid isn't
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0f the 64 students in grade five, 3/8 of them either walk or ride a bike to school. The rest take a bus. How many fifth graders
UkoKoshka [18]
40 fifth graders take a bus to school. 8x8= 64 so they have you a good fraction to start with to find out how many kids are walking or taking their bike (3/8) all you have to do is multiply 3 and 8 which equals 24 to find the fraction of the amount of kids who take the bus you subtract 3 from 8 which gives 5/8 and to get the answer you multiply 5 and 8 which is 40.
3 0
3 years ago
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