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lina2011 [118]
3 years ago
10

PLEASEE HELP.!! ILL GIVE BRAINLIEST.!! *EXTRA POINTS* DONT SKIL:((

Mathematics
1 answer:
Stels [109]3 years ago
8 0

Answer:

1/3

Step-by-step explanation:

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Scores on an english test are normally distributed with a mean of 31.5 and a standard deviation of 7.3. find the score that sepa
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Let X be the score on an english test which is normally distributed with mean of 31.5 and standard deviation of 7.3

μ = 31.5 and σ =7.3

Here we have to find score that separates the top 59% from the bottom 41%

So basically we have to find here x value such that area above it is 59% and below it is 49%

This is same as finding z score such that probability below z score is 0.49 and above probability is 0.59

P(Z < z) = 0.49

Using excel function to find the z score for probability 0.49 we get

z = NORM.S.INV(0.49)

z = -0.025

It means for z score -0.025 area below it is 41% and above it is 59%

Now we will convert this z score into x value using given mean and standard deviation

x = (z* standard deviation) + mean

x = (-0.025 * 7.3) + 31.5

x = 31.6825 ~ 31.68

The score that separates the top 59% from the bottom 41% is 31.68

3 0
3 years ago
PQRS is a quadrilateral.
olga nikolaevna [1]

Answer:

y = 95° (being corresponding angle)

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7 0
3 years ago
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The lengths of the sides of a triangle are given below. Classify the triangle as acute, obtuse, or right.
abruzzese [7]

Answer:

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Step-by-step explanation:

<u>Lets verify with Pythagorean:</u>

  • 17² = 289
  • 13² + 14² = 169 + 196 = 365
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The angle opposite to a greater side is less than 90° and the sum of the squares are close.

It means all three angles<u> are less than 90°</u>.

With this the triangle is <u>acute</u>.

Correct choice is A.

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3 years ago
24÷2²(-3)-7-2²-2(3-6) step by step please and thank you!​
gavmur [86]

Answer:

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Step-by-step explanation:

24 \div {2}^{2} ( - 3) - 7 -  {2}^{2}  - 2(3 - 6) \\ 24 \div  {2}^{2} ( - 3) - 7 -  {2}^{2}  - 2( - 3) \\ 24 \div 4( - 3) - 7 -  4  - 2( - 3)\\ 6(-3) - 7 - 4 -2(- 3) \\  - 18 - 7 - 4 + 6 \\ -25 -4 +6 \\ -29 +6 \\ - 23

8 0
3 years ago
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Simplify. 5(x - y) - (x - y) <br> a. x - y <br> b. x y <br> c. 4x - 4y <br> d. 4x 4y
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C is the answer hope this helps. 
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