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riadik2000 [5.3K]
2 years ago
6

32 = 1.69 is this correct

Mathematics
1 answer:
ddd [48]2 years ago
3 0
Yes this is correct answer
You might be interested in
A statistics student wants to compare his final exam score to his friend's final exam score from last year; however, the two exa
yarga [219]

Answer:

z= \frac{85-70}{10}=1.5

z= \frac{45-35}{5}=2

So then the correct answer for this case is:

B) Our student, Z= 1.50; his friend, Z=2.00.

Step-by-step explanation:

Assuming this complete question:

A statistics student wants to compare his final exam score to his friend's final exam score from last year; however, the two exams were scored on different scales. Remembering what he learned about the advantages of Z scores, he asks his friend for the mean and standard deviation of her class on the exam, as well as her final exam score. Here is the information:

Our student: Final exam score = 85; Class: M = 70; SD = 10.

His friend: Final exam score = 45; Class: M = 35; SD = 5.

The Z score for the student and his friend are:

A) Our student, Z= -1.07; his friend, Z= -1.14.

B) Our student, Z= 1.50; his friend, Z=2.00.

C) Our student, Z= 1.07; his friend, Z= -1.14.

D) Our student, Z= 1.07; his friend, Z= 1.50

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

Let X the random variable that represent the scores for our student, and for this case we know that:

E(X)= \mu =70, SD_X=\sigma=10  

The z score is given by:

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

If we use this we got:

z= \frac{85-70}{10}=1.5

Let Y the random variable that represent the scores for his friend, and for this case we know that:

E(Y)= \mu =35, SD_Y=\sigma=5  

The z score is given by:

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

If we use this we got:

z= \frac{45-35}{5}=2

So then the correct answer for this case is:

B) Our student, Z= 1.50; his friend, Z=2.00.

3 0
3 years ago
If your grocery bill total was $205.67 and was reduced to $145.90 after coupons, what was the percent decrease? Round to the nea
anzhelika [568]

Answer:

Step-by-step explanation:

start by subtracting the original value from the reduced value.

205.67-145.90=59.77

now compare the change of rate

59.77=r(205.67)

59.77/205.67=r

r=29%

7 0
3 years ago
I need to find the diameter, radius, circumference, and area.
Zielflug [23.3K]
Diameter is 13
radius is 6.5
circumference is 13pi or 40.84
area is 42.25pi or 132.732
7 0
3 years ago
Can someone please help me on this?
Elza [17]

Answer:

First angle: 27

Second angle: 135

Third angle: 18

Draw a triangle with one obtuse angle and 2 acute angles.

Step-by-step explanation:

<u>Determine the variables</u>:

first angle: f

second angle: s

third angle: t

<u>Write an equation for the second angle:</u>

s=5f

<u>Write an equation for the third angle:</u>

t=2/3f

<u>Write an equation for the total angle measurements:</u>

s+t+f=180

<u>Substitute them and solve</u>

5f+2/3f+f=180

f=27

5(27)=135=s

2/3(27)=18=t

First angle: 27

Second angle: 135

Third angle: 18


6 0
2 years ago
Which equation can be simplified to find the inverse of y = x2 – 7?
Naddika [18.5K]
To find the inverse of the function you can just exchange the name of the variables, change x for y and y for x..

original (direct) function: y = x^2 - 7

inverse function x = y^2 - 7

Then, the answer is the option c.




7 0
2 years ago
Read 2 more answers
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