3 years ago

HELP FAST PLEASEEEEEE

Mathematics

1 answer:

MrRissso [65]3 years ago

5 0

Answer:

d.......................

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An article claims that 12% of trees are infested by a bark beetle. A random sample of 1,000 trees were tested for traces of the

inna [77]

Answer: 0.6812

Step-by-step explanation:

Let p be the population proportion of trees are infested by a bark beetle.

As per given: p= 12%= 0.12

Sample size : n= 1000

Number of trees affected in sample = 1000

Sample proportion of trees are infested by a bark beetle. = $\hat{p}=\dfrac{127}{1000}=0.127$

Now, the z-test statistic : $z=\dfrac{\hat{p}-p}{\sqrt{\dfrac{p(1-p)}{n}}}$

So, $z=\dfrac{0.127-0.12}{\sqrt{\dfrac{0.12\times 0.88}{1000}}}$

$z=\dfrac{0.007}{\sqrt{\dfrac{0.1056}{1000}}}\\\\\\=\dfrac{0.007}{\sqrt{0.0001056}}\\\\\\=\dfrac{0.007}{0.010276}\approx0.6812$

Hence, the value of the z-test statistic = 0.6812 .

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3 years ago

What is 1.75 kilometres as a fraction of 700 metres? <br>Give your answer in its simplest form

aniked [119]

Answer:

5/2

Step-by-step explanation:

1000m = 1km

1.75km = 1750m

1750 / 700 = 5/2

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2 years ago

1. 5(2x + 1) = 35<br> I need help what’s the answer showed work

Airida [17]

Answer:

x=3

Step-by-step explanation:

5(2x+1)=35

Step 1: Simplify both sides of the equation.

5(2x+1)=35

(5)(2x)+(5)(1)=35(Distribute)

10x+5=35

Step 2: Subtract 5 from both sides.

10x+5−5=35−5

10x=30

Step 3: Divide both sides by 10.

x=3

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3 years ago

Daniel bought 2 boards of wood for a school project. one board is 24 inches long, and the other board is 20 inches long. he want

lisov135 [29]

Answer:

48 inches (i tried)

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2 years ago

A bicycle travels at a rate of 18 miles per hour for 3 hours. Let y be the distance, in miles, the bicycle travels for a given a

Sloan [31]

Answer:

I think it would be (18y)x(3x)

Step-by-step explanation:

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3 years ago

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