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daser333
10 days ago
12

Scores on an exam follow an approximately normal distribution with a mean of 76.4 and a standard deviation of 6.1 points. what i

s the minimum score you would need to be in the top 5%?
Mathematics
1 answer:
AnnZ [3.9K]10 days ago
5 0
The highest 5% of scores corresponds to the 95th percentile, meaning the cutoff score k is defined as

\mathbb P(X

When transformed into the standard normal distribution,

\mathbb P(X

A cumulative probability of 95% corresponds to a z-score of approximately k^*=1.6449, indicating that the cutoff score is likely around

1.6449=\dfrac{k-76.4}{6.1}\implies k\approx86.4
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Given f(x) and g(x) = f(x) + k, look at the graph below and determine the value of k. k = ______ Graph of two lines. f of x equa
lawyer [4039]

Solution:

We know, g(x) = f(x) + k --------(1)

It is given that f(x) = \frac{1}{3}(x+2)

and g(x) = \frac{1}{3}(x+5)

Substituting f(x) and g(x) into equation (1):

→ \frac{1}{3}(x+5) = \frac{1}{3}(x+2) + k

→ \frac{1}{3}[x+5-x-2] = k

→ k = \frac{1}{3} \times 3=1

Thus, the value of k is 1.

7 0
4 days ago
Olga Decorat blankets with ribbon she has 12 yards of ribbon she uses 22 feet of the ribbon to decorate blankets after she decor
Svet_ta [4341]

Response:

  14 feet

Detailed explanation:

<pThere are 3 feet for each yard, resulting in a total of 36 feet in 12 yards. The leftover ribbon will equal the initial amount minus what has been utilized.

  36 - 22 = 14.... feet left

3 0
8 days ago
Which steps can be used to solve StartFraction 6 Over 7 EndFraction x + one-half = StartFraction 7 Over 8 EndFraction for x? Che
lawyer [4039]

Response:

First, subtract one-half from each side of the equation.

Next, divide both sides by 6/7.

Then, multiply each side by 7/6.

Detailed explanation:

I simply took the question on ed.

8 0
8 days ago
Read 2 more answers
There is an integer n such that 2n2 − 5n + 2 is prime. To prove the statement it suffices to find a value of n such that (n, 2n2
Leona [4187]

Response:

n = 0 or 3

Detailed explanation:

2n² - 5n + 2

2n² - 4n - n + 2

2n(n - 2) -1(n - 2)

(n - 2)(2n - 1)

A prime number is defined as one that can only be divided by itself and 1

Setting n-2 = 1 gives n = 3

Setting 2n-1 = 1 gives n = 0

7 0
15 days ago
Which are correct representations of the inequality –3(2x – 5) &lt; 5(2 – x)? Select two options. x &lt; 5 –6x – 5 &lt; 10 – x –
Zina [3917]

Answer:

The accurate representations are:

- 6x + 15 < 10 - 5x ⇒ 3rd option

A circle is open at 5 with a bold line extending right from 5 ⇒ 4th option (see diagram)

Step-by-step explanation:

Given the inequality is -3(2x - 5) < 5(2 - x)

First, simplify both sides:

∵ -3(2x - 5) = -3(2x) + -3(-5)

Remember that (-)(-) results in (+)

Thus, -3(2x - 5) = - 6x + 15

∵ 5(2 - x) = 5(2) + 5(-x)

Remember that (+)(-) results in (-)

Then, 5(2 - x) = 10 - 5x

Now we have: - 6x + 15 < 10 - 5x

Subtract 15 from both sides

So: - 6x < -5 - 5x

Add 5x to both sides

Thus, - x < - 5

Note that since the coefficient of x is negative, we reverse the inequality sign when dividing both sides by it

∵ The coefficient of x is -1

Therefore, dividing both sides by -1 gives us x > 5

The accurate representations are:

- 6x + 15 < 10 - 5x ⇒ 3rd option

A circle is open at 5 with a bold line extending right from 5 ⇒ 4th option (see diagram)

7 0
1 day ago
Read 2 more answers
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