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Svet_ta [14]
3 years ago
6

Help pls ty! it means a lot! look at image attached pls! :)

Mathematics
1 answer:
slamgirl [31]3 years ago
7 0

Answer:

its B

Step-by-step explanation:

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Rachael got a 550 on the analytical portion of the Graduate Record Exam (GRE). If GRE scores are normally distributed and have m
valina [46]

Answer:

Z=-2

This value means that the score of Rachel 550 it's 2 deviations below the mean of the population \mu=600

Step-by-step explanation:

1) 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".  

\mu=600 represent the population mean for the Graduate Record Exam (GRE)

\sigma=25 represent the population standard deviation for Graduate Record Exam (GRE)

2) Solution to the problem

Let X the random variable that represent the Graduate Record Exam (GRE) of a population, and for this case we know the distribution for X is given by:

X \sim N(600,25)  

Where \mu=600 and \sigma=25

We want to find the z score for a score of 550. And in order to do this we need to apply the formula for the z score given by:

z=\frac{x-\mu}{\sigma}

If we apply this formula to our probability we got this:

z=\frac{550-600}{25}=-2

So the answer for our case would be Z=-2

This value means that the score of Rachel 550 it's 2 deviations below the mean of the population \mu=600

7 0
3 years ago
How do you show a model for 3/4× 1/3
Mila [183]
You multiply the numerator and denominator of 3/4 with 3 and multiply 1/3 with 4 on the bottom and top and after  you get 36/144 you simplify it and you get 1/4 so thats your answer
 
4 0
3 years ago
Read 2 more answers
What choice is it?? please help
Illusion [34]
I think it’s A?? Idk just my opinion I’m sorry if it’s wrong
8 0
3 years ago
Please help I’m so confused and my parents are gonna kill me if I don’t get my homework done...
Thepotemich [5.8K]

Answer:

X=-6

Step-by-step explanation:

the sum of interior angels in a triangle is 180.

52+78=130

180-130=50

to get 56 to 50 x has to be negative

hope this helps :)

8 0
3 years ago
Read 2 more answers
Help me I don’t understand
bezimeni [28]
To add fractions, find the LCD - lowest common denominater, and then Combine. For LCD find where both bottom numbers equal the same so in this case you would have to multiply 9 times 11 and vice versa to equal 99. Once you do that the 5 thats on top of the 9 will also have to be multiplied by 11 and the 4 on top of the 11 will have to be multiplied by 9 so it could make sense. Now you must Combine - it would be 55/11 + 36/11. you only add the top numbers and leave the bottom number.(that is what its out of). Thus the answer is 91/11.
Answer is 99
8 0
3 years ago
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