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Lady bird [3.3K]
3 years ago
9

Which is relatively​ better: a score of 79on a psychology test or a score of 48on an economics​ test? scores on the psychology t

est have a mean of 85and a standard deviation of 5.scores on the economics test have a mean of 52and a standard deviation of 3?
Mathematics
1 answer:
igomit [66]3 years ago
8 0
Psychology 

<span>z =(48-87)/14 </span>

<span>z = -2.796 </span>
<span>Economics </span>

<span>z =(52-53)/8 </span>

<span>z = -0.125 </span>

<span>The score of Economics is better.</span>
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Two different ways to find the difference for 12-3
Gennadij [26K]
For this case we have:

 way 1:
 
Common factor 3 in the expression:
 12-3 = 3 (4-1)&#10;&#10;12-3 = 3 (3)&#10;&#10;12-3 = 3 (9)

 Way 2:
 
Write the number 12 as the sum of 4 times 3:
 12-3 = (3 + 3 + 3 + 3) - 3&#10;
 Then, for associative property:
 12-3 = 3 + 3 + 3 + (3 - 3)&#10;&#10;12-3 = 3 + 3 + 3 + (0)&#10;&#10;12-3 = 3 + 3 + 3&#10;&#10;12-3 = 9
8 0
3 years ago
Read 2 more answers
Classify the number. Check all that apply.
kow [346]
It is an irrational number. A number is rational if it can be expressed as a quotient of 2 integer numbers. Number π2 cannot be expressed as a quotient of integers, so it is an irrational number.
8 0
3 years ago
Answer with explanation please!
VLD [36.1K]

Answer:

E

Step-by-step explanation:

The external angle of a triangle is equal to the sum of the 2 opposite interior angles.

8x + 15 is an external angle of the triangle, thus

8x + 15 = 3x + 20 + 4x + 5, that is

8x + 15 = 7x + 25 ( subtract 7x from both sides )

x + 15 = 25 ( subtract 15 from both sides )

x = 10

Thus none of them on the list → E

3 0
3 years ago
Kesley is thinking of a number. She says that it’s the sum of a number and nine. Multiplied by 2/3, is equal to -18.
Aliun [14]

Answer:

Only the firsts and fourth choices (\frac{2}{3}(x+9)=-18 and \frac{2}{3}x+6=-18)

Step-by-step explanation:

Turn the equation into words:

"A number plus 9"

(x+9)

"Multiplied by \frac{2}{3}"

\frac{2}{3} (x+9)

"Is equals to -18"

\frac{2}{3}(x+9)=-18

Distribute to find the second equation:

\frac{2}{3}(x+9)=-18\\\frac{2}{3}x+6=-18

7 0
2 years ago
The angle of elevation from the top of a building to the top of another is 45°.
MrRa [10]

Answer:

402m

Step-by-step explanation:

Set this up as a triangle and use trig to solve it:

tan(45) = y/402

y = 402*tan(45)

substitute: tan(45) = 1

y = 402 * 1

y = 402m

4 0
3 years ago
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