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artcher [175]
3 years ago
6

H E L P!!!!!!!!!!!!!!!!!!!

Mathematics
1 answer:
LenaWriter [7]3 years ago
4 0

Answer:

a

Step-by-step explanation:

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In a recently administered iq test, the scores were distributed normally, with mean 100 and standard deviation 15. what proporti
iragen [17]

To solve for proportion we make use of the z statistic. The procedure is to solve for the value of the z score and then locate for the proportion using the standard distribution tables. The formula for z score is:

z = (X – μ) / σ

where X is the sample value, μ is the mean value and σ is the standard deviation

 

when X = 70

z1 = (70 – 100) / 15 = -2

Using the standard distribution tables, proportion is P1 = 0.0228

 

when X = 130

z2 = (130 – 100) /15 = 2

Using the standard distribution tables, proportion is P2 = 0.9772

 

Therefore the proportion between X of 70 and 130 is:

P (70<X<130) = P2 – P1

P (70<X<130) = 0.9772 - 0.0228

P (70<X<130) = 0.9544

 

Therefore 0.9544 or 95.44% of the test takers scored between 70 and 130.

6 0
3 years ago
A pyramid has a rectangular base with dimensions of 3 feet by 7 feet. The height of the rectangular pyramid is 6 feet. Water fil
Alja [10]

Answer:

Step-by-step explanation:

Michael and Juanita are interested in the amount of sand required to build a sand pyramid of the size that they see while at a sand sculpture exhibit.  They carefully measure the width of the square base of the sand pyramid which is 4 feet and the height of the pyramid which is 5 feet.  How much sand is required to build this sand pyramid?

3 0
3 years ago
Deyonne made 25% more cookies than Cameron. They sold cookies for $0.50 each. Let x represent the number of cookies Cameron made
Juli2301 [7.4K]
First we define the varible to use:
 x = represent the number of cookies
 Cameron:
 
The amount of cookies he made was:
 x
 Deyonne:
 
We can rewrite the amount in different ways:
 x + 0.25x
 1.25x
 Then, the total revenue is:
 0.50 * (x + (x + 0.25x))
 We rewrite:
 0.50 * (x + 1.25x)
 0.50 * (2.25x)
 Answer:
 
The following expressions represent possible revenue from the sales:
 
F. 0.50 (2.25x
 
C. 0.50 (x + 1.25x)
 
A. 0.50 [x + (x + 0.25x)]
5 0
3 years ago
If a² + b² = z and ab = y, which of the following is equivalent to 4z + 8y? Show all the steps.
Ivenika [448]

Answer:

The answer to your question is:       (2a + 2b)²

Step-by-step explanation:

a² + b² = z

ab = y

Which is equivalent to 4z + 8y ?

Substitution

                                     4(a² + b²) + 8(ab)

Simplify                        4a² + 4b² + 8ab

Order                            4a² + 8ab + 4b²       It's a perfect square trynomial

Factorize                     (2a + 2b)²

7 0
3 years ago
Read 2 more answers
Simplify enter your answer
ioda
Answer: 5/14

Explanation:
19-14=5
3 0
2 years ago
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