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Tasya [4]
3 years ago
13

For a sample of n = 30 scores, X = 45 corresponds to z = 1.50 and X = 40 corresponds to z = +1.00. What are the values for the s

ample mean and standard deviation?
Mathematics
1 answer:
TEA [102]3 years ago
3 0

Answer:

30

Step-by-step explanation:

Here, it is given that the Z – score corresponding to the score X = 45 is 1.5 and the Z – score corresponding to the score X = 40 is...

Z = \frac{X - M}{S}

So:

1/ 1.5 = \frac{45 - M}{S} and 1 = \frac{40 -M}{S} . solve the both equations, we found out:

<=> S = 10

=> M = 30

Hence, mean is:

M = 45 -1.5S = 45 - 1.5 (10) = 30

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Factor completely.<br> 28 – 7x2
coldgirl [10]

Answer:

7(2+x)(2-x)

Step-by-step explanation:

Both terms are perfect squares,use the difference of square formulas

a^2-b^2=(a+b)(a-b) where a=2 and b=x

5 0
3 years ago
I need help &amp; a explanation on the answer please !
GrogVix [38]

You would do 4 divided by 3. Which is 1.33 with repeating 3s. You would then round to the nearest hundredth which would 1.33. You can multiply 1.33 and 3 to check your work. Although it might not exactly 4 it is not that big of a deal.

Hope this helps!

3 0
3 years ago
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ElenaW [278]

Answer:

3/15

Step-by-step explanation:

6 0
3 years ago
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an angle measures 24° less than the measure if a supplementary angle . what is the measure of each angle​
vagabundo [1.1K]

Hey there!

If two angles are supplementary, that means that the measures of the two angles have a sum of 180.

If the two angles were of equal measure, they would both be 90 degrees.

The easiest way to get this would be to subtract 12 degrees from one 90 degree angle and add them to the other 90 degree angle so one angle has 24 more degrees then the other.

90 - 12 = 78

90 + 12 = 102

Let's check to make sure this works.

102 + 78 = 180 That checks out.

102 - 24 = 78 That also works.

So, the measures of the angles are 102 and 78.

Hope this helps!

4 0
3 years ago
PLEASE HELP!!!!
MrMuchimi
   
\displaystyle\\&#10;\bf\\&#10;log_{x+5} 36 = 2\\\\&#10;\Longrightarrow~~(x+5)^2 = 36\\\\&#10;(x+5)^2 = 6^2\\\\&#10;x+5= 6\\\\&#10;x = 6 - 5 = \boxed{\bold{1}}



6 0
3 years ago
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