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AfilCa [17]
2 years ago
13

Please help will mark brainliest!

Mathematics
1 answer:
andre [41]2 years ago
4 0

Answer:

A will be the correct answer

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Trees planted by a landscaping firm have a 90% one-year survival rate, If they plant 10 trees in a park, what is the following p
Mnenie [13.5K]

Answer:

Pr(all will survive in one year) = 0.35 to 2 decimal places

Pr(at least 8 will survive) = 0.39 to 2 decimal places.

Step-by-step explanation:

Probability of a tree surviving one year is 0.9. While not surviving probability is 1 - 0.9 = 0.1

This is obtained from the 90℅ surviving rate for one year planted by the landscaping firm.

Probability that if 10 trees are planted, all will survive for one year is:

0.9x0.9x0.9x0.9x0.9x0.9x0.9x0.9x0.9x0.9 = 0.9^10 = 0.349

Probability that at least 8 will survive in one year can be expressed as

8 survived x 2 not survived +(or) 9 survived x 1 not survived +(or) 10 survived

= [(0.9^8)x(0.1^2) + (0.9^9)x(0.1^1) + (0.9^10)] = 0.391

6 0
3 years ago
What is 3/4 divided by 3 1 /4
OleMash [197]

Answer:

30/31

Step-by-step explanation:

5 0
3 years ago
Read 2 more answers
A circle with area 100 pi has a sector with a central angle of 2/5 pi radians. What is the area of the sector?
Zarrin [17]

we know that

2pi radians (full circle)  has an area of-----------------> 100pi

then

(2pi/5) radians----------------------------> X

X=(2pi/5)*100pi/2pi---------> 20pi units²

the answer is

20pi units²

4 0
3 years ago
The amount of gas that a helicopter uses is directly proportional to the number of hours spent flying. the helicopter flies for
Anna007 [38]
3232 gallons of fuel are used up

7 0
3 years ago
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I need your help please!
Aneli [31]

Answer:

1 mile is mapped to 0.3428 inches i.e. unit rate is 0.3428 inches/mile.

Step-by-step explanation:

Given that the scale of the map is \frac{3}{10} inches = \frac{7}{8} miles ....... (1)

Now, we have to convert this map scale to a unit rate.

And the unit rate is the number of inches per mile.  

As the scale is constant, therefore from the the relation (1) we get  

1 mile = \frac{3 \times 8}{10 \times 7} = 0.3428 inches.

Therefore, 1 mile is mapped to 0.3428 inches i.e. unit rate is 0.3428 inches/mile.  (Answer)

5 0
3 years ago
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