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2 years ago

8

sarah worked out for 15 today. she plans to add 5 min per week. write qnd equation to represent how many minutes she will be wor

king oht after x weeks

1 answer:

garik1379 [7]2 years ago

4 0

Answer:

I think its 15 + 5x

Step-by-step explanation:

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Given that z is a standard normal random variable, find z for each situation. The area between 0 and z is .4750. Answer The area

algol13

Answer:

$P(0$

And solving for z we have

$P(Z$

And we can find the value for z with the following excel code:

"=NORM.INV(0.975,0,1)"

And we got z =1.96

$P(Z>z)= 0.1314$

And we can use the complement rule and we got:

$P(Z>z) = 1-P(Z$

$P(Z$

And we can find the value for z with the following excel code:

"=NORM.INV(0.8686,0,1)"

And we got z =1.120

$P(Z$

And we can find the value for z with the following excel code:

"=NORM.INV(0.67,0,1)"

And we got z =0.440

Step-by-step explanation:

Previous concepts

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

The Z-score is "a numerical measurement used in statistics of a value's relationship to the mean (average) of a group of values, measured in terms of standard deviations from the mean".

Solution to the problem

We want this probability:

$P(0$

And solving for z we have

$P(Z$

And we can find the value for z with the following excel code:

"=NORM.INV(0.975,0,1)"

And we got z =1.96

For the next part we want to calculate:

$P(Z>z)= 0.1314$

And we can use the complement rule and we got:

$P(Z>z) = 1-P(Z$

$P(Z$

And we can find the value for z with the following excel code:

"=NORM.INV(0.8686,0,1)"

And we got z =1.120

For the next part we want to calculate:

$P(Z$

And we can find the value for z with the following excel code:

"=NORM.INV(0.67,0,1)"

And we got z =0.440

6 0

3 years ago

Students from two age groups were surveyed to see how they travel to school. Here are the results:

liq [111]

Answer:

The table representing the number of students by which mode of transport they travel is given as:

Walk or bike Bus Car Row Total

Below age 15 87 60 18 165

Age 15 and above 65 50 80 195

Column Total 152 110 98 360

We know that a relative frequency of an event is the ratio of frequency to the total number of trials.

i..e we divide each frequencies by 360 to obtain a two-way relative frequency.

Hence,the table is given as:

Walk or bike Bus Car Row Total

Below age 15 0.24 0.17 0.05 0.46

Age 15 and above 0.18 0.14 0.22 0.54

Column Total 0.42 0.31 0.27 1

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3 years ago

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If anybody body answering just say it's a,b, or c

ohaa [14]

Answer:I think b

Step-by-step explanation:

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3 years ago

Brenda observes that the keyboard and the screen of an open laptop lie on two different planes. In how many lines do the planes

Lerok [7]

Let's assume the laptop is opened at 90 degrees (this is done for the sake of simplicity, is actually irrelevant) then each plane would be analogous to the 'x' and 'y' planes you see in a Cartesian Plane, which only intersect at one point called the Origin. Any two lines with different slopes will intersect only one time (if they're parallel they have the same slope)

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3 years ago

The population of fish in a certain lake increases, on average, by 1.8% per year. If there are 950 fish currently in the lake. H

JulijaS [17]

To do this, you must do 950x1.8%, and get the number. Then add that number and 950 to get the amount of fish in it after one year. Repeat those steps 9 more times and you get your answer. In this case, the answer would be 1,313 fish. Your welcome!

5 0

3 years ago

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