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3 years ago

Someone help me i’ll give brainlest if you answer this one and my other few

Mathematics

1 answer:

zhuklara [117]3 years ago

7 0

Answer:

Step-by-step explanation:

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18 laps in 6 minuets

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3 years ago

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Suppose that the pH of soil samples taken from a certain geographic region is normally distributed with a mean pH of 7 and a sta

Otrada [13]

Answer:

a) P=0

b) P=1

c) P=0

d) X=7.1645

Step-by-step explanation:

We have the pH of soil for some region being normally distributed, with mean = 7 and standard deviation of 0.10.

a) What is the probability that the resulting pH is between 5.90 and 6.15?

We calculate the z-score for this 2 values, and then compute the probability.

$z_1=(X_1-\mu)/\sigma=(5.9-7.0)/0.1=-11\\\\z_2=(X_2-\mu)/\sigma=(6.15-7)/0.1=-8.5$

Then the probability is

$P(5.90$

b) What is the probability that the resulting pH exceeds 6.10?

We repeat the previous procedure.

$z=(6.10-7)/0.1=-9\\\\P(x>6.1)=P(z>-9)=1$

c) What is the probability that the resulting pH is at most 5.95?

$z=(5.95-7)/0.1=-10.5\\\\P(x$

d. What value will be exceeded by only 5% of all such pH values?

We have to calculate the value of pH for which only 5% is expected to be higher. This can be represented as P(X>x)=0.05.

In the standard normal distribution, it happens for a z=1.645.

$P(z>1.645)=0.05$

Then, we can calculate the pH as:

$x=\mu+z\sigma=7.0+1.645*0.1=7.0+0.1645=7.1645$

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3 years ago

It takes a copy machine 6 minutes to complete a job. How many minutes are left on a job if 2/3 of the job is now complete?

ipn [44]

2/3 of the job was completed in 4 minutes. the job left will be completed in 2 minutes

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3 years ago

PLEASEEEE HELLLPPP MEEEEE

Mariana [72]

Answer:

The Answer is A because that is correct

Step-by-step explanation:

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3 years ago

14x - 7y = 21 is a linear equation written in Standard Form. What is the slope and y-intercept ?

Aleonysh [2.5K]

Answer: m=2, b=-3
Explanation: rewrite in slope intercept form - y=2x-3. Subtracting is the same as adding therefore it becomes, y=2x+(-3) then using the formula- y=Mx+b identify the slope which is 2 then identify the y-intercept which would be -3.

Hope that helps! Have a good day :)

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2 years ago

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