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4 years ago

Jeremy's score was 1.75 standard deviations above the mean. which kf thr following is closest to his percentile rank

Mathematics

1 answer:

Gelneren [198K]4 years ago

4 0

The answer is 96%.

Explanation:
It is generally presumed that the scores are normally distributed.

1) You are given how many standard deviations from the mean Jeremy's score is. This is exactly the definition of the z-score. Therefore z = 1.75

2) Look at a left-tail z-table in order to find the area of the normal curve on the left of your z-score (see picture attached). A = 0.9599

3) Multiply the area by 100 in order to find the percentile:
0.9599 × 100 = 95.99
Therefore, 95.99% of the students scored less than Jeremy.

Hence, the answer is 96%.

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Answer:

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and length and width of the larger box = l and w , repectively

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Volume = length * width * height

So Volume of the larger box = l*w*h = lwh

Now the question says

the height of the smaller box is 80% of the height of the larger box

It means

Height of the smaller box = 80% of h = 0.80*h = 0.80h

and the other two dimensions are same so it means length and width of the smaller box = l and w

so, Volume of the smaller box = l*w*0.80h = 0.80lwh

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Step-by-step explanation:

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3 years ago

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Simora [160]

Answer:

no real solutions

Step-by-step explanation:

If equation is...

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= no real solutions

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3 years ago

Is 5 1/2 in the set of integers, whole numbers, both or neither

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4 years ago

the price of a guiter was decreased by 15% and sold for 275.99. what was the orignal price of the guiter in dollers?

KATRIN_1 [288]

Answer: 317.39

Step-by-step explanation:

The price of the guitar decreased by15%

Original price is 275.99

To get the reduced amount

It will be 15% of the exact amount and add to the exact to get the original

15/100×275.99

=41.3985

To get exact,

reduced amount + sold price

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4 years ago

Please help me with this!! Thank u

topjm [15]

Answer:

Step-by-step explanation:

Left

When a square = a linear, always expand the squared expression.

x^2 - 2x + 1 = 3x - 5 Subtract 3x from both sides

x^2 - 2x - 3x + 1 = -5

x^2 - 5x +1 = - 5 Add 5 to both sides

x^2 - 5x + 1 + 5 = -5 + 5

x^2 - 5x + 6 = 0

This factors

(x - 2)(x - 3)

So one solution is x = 2 and the other is x = 3

Second from the Left

i = sqrt(-1)

i^2 = - 1

i^4 = (i^2)(i^2)

i^4 = - 1 * -1

i^4 = 1

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16(1) - 8(-1) + 4

16 + 8 + 4

Second from the Right

This one is rather long. I'll get you the equations, you can solve for a and b. Maybe not as long as I think.

12 = 8a + b

17 = 12a + b Subtract

-5 = - 4a

a = - 5/-4 = 1.25

12 = 8*1.25 + b

12 = 10 + b

b = 12 - 10

b = 2

Now they want a + b

a + b = 1.25 + 2 = 3.25

Right

One of the ways to do this is to take out the common factor. You could also expand the square and remove the brackets of (2x - 2). Both will give you the same answer. I think expansion might be easier for you to understand, but the common factor method is shorter.

(2x - 2)^2 = 4x^2 - 8x + 4

4x^2 - 8x + 4 - 2x + 2

4x^2 - 10x + 6 The problem is factoring since neither of the first two equations work.

(2x - 2)(2x - 3) This is correct.

So the answer is D

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3 years ago