help asap please!!!!

Answer:

272 is the test score for Brandi.

Step-by-step explanation:

Normal Probability Distribution:

Problems of normal distributions can be solved using the z-score formula.

In a set with mean [tex]\mu[/tex] and standard deviation [tex]\sigma[/tex], the z-score of a measure X is given by:

[tex]Z = \frac{X - \mu}{\sigma}[/tex]

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the p-value, we get the probability that the value of the measure is greater than X.

Mean of 250 and standard deviation of 25:

This means that [tex]\mu = 250, \sigma = 25[/tex]

Brandi scored at the 81st percentile on this test. What was her test score?

The z-score of her score of X has a p-value of 0.81. This means that her score is given by X when Z = 0.88.

[tex]Z = \frac{X - \mu}{\sigma}[/tex]

[tex]0.88 = \frac{X - 250}{25}[/tex]

[tex]X - 250 = 0.88*25[/tex]

[tex]X = 272[/tex]

272 is the test score for Brandi.

Answer:

[tex]V=137.25\ cm^3[/tex]

Step-by-step explanation:

Given that,

The diameter of the sphere, d = 6.4 cm

Radius, r = 3.2 cm

We need to find the volume of the sphere. The formula for the volume of a sphere is given by :

[tex]V=\dfrac{4}{3}\pi r^3\\\\=\dfrac{4}{3}\pi \times (3.2)^3\\\\=137.25\ cm^3[/tex]

So, the volume of the sphere is equal to [tex]137.25\ cm^3[/tex].

Answer:

Possibly a 2 x 15 pencil box :)

Answer:

[tex]\sum\limits^7_{n=1}(4n - 3)[/tex]

Step-by-step explanation:

Given

[tex]1 + 5 + 9 + .....[/tex]

Required

Write a definition

First, we derive a formula for the series using:

[tex]T_n = a + (n - 1)d[/tex]

From the attached data;

[tex]a = 1[/tex]

[tex]d = 5 - 1 = 4[/tex]

So:

[tex]T_n = a + (n - 1)d[/tex]

[tex]T_n = 1 + (n - 1) * 4[/tex]

[tex]T_n = 1 + 4n - 4[/tex]

Collect like terms

[tex]T_n = 4n - 4+1[/tex]

[tex]T_n = 4n -3[/tex]

So, the definition for first 7 terms is:

[tex]\sum\limits^7_{n=1}(4n - 3)[/tex]

Answer:

The 15th term is 8

Step-by-step explanation:

Answer:

x = 209.2

Step-by-step explanation:

Normal Probability Distribution:

Problems of normal distributions can be solved using the z-score formula.

In a set with mean [tex]\mu[/tex] and standard deviation [tex]\sigma[/tex], the z-score of a measure X is given by:

[tex]Z = \frac{X - \mu}{\sigma}[/tex]

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X, or the area to the left of X. Subtracting 1 by the p-value, we get the probability that the value of the measure is greater than X, which is the area to the right of X.

Mean of 185 and a standard deviation of 20.

This means that [tex]\mu = 185, \sigma = 20[/tex]

Find the value of x so that the area under the normal curve to the left of x is approximately 0.8869.

This is X when Z has a p-value of 0.8869, so X when Z = 1.21.

[tex]Z = \frac{X - \mu}{\sigma}[/tex]

[tex]1.21 = \frac{X - 185}{20}[/tex]

[tex]X - 185 = 20*1.21[/tex]

[tex]X = 209.2[/tex]

So

x = 209.2

Answer:

1 second

Step-by-step explanation:

The 2 equations are

y = - 16x² + 30 → (1)

y = 14 → (2)

Substitute y = 14 into (1)

14 = - 16x² + 30 ( subtract 30 from both sides )

- 16 = - 16x² ( divide both sides by - 16 )

1 = x² ( take the square root of both sides )

x = [tex]\sqrt{1}[/tex] = 1

The object is in the air for 1 sec before it crosses the bird's path

Answer:

So, the answer in short is B) (6,1)

Step-by-step explanation:

If you graph the points, then you see that point A is 8 points away from point B on the X-axis. If you take 8 and divide it by 4, you get 2, so that means that the 1/4 way point is 2 points away from point A, giving you 6 as your x-axis point for this new point. B is the only one with 6 as its spot on the x axis, leaving B as the only choice. BTW you're pretty cute ;)

Answer:

0.5: 0.2: 0.4:

Fair Coin Blue Block Blue Marble

Soccer Ball Red Block

Dice Yellow Marble

Tennis Ball

Step-by-step explanation:

Answer:

Simple use tangent, which is equal to opposite divided by adjacent, so tan34=x/16, so multiply both sides by 16 to get x=10.79213627

Step-by-step explanation:

Answer:

no.6 is 22in. while in no.7 is 18cm

Answer:

The swimmer must move in the direction 338.2°

Step-by-step explanation:

Since the river flows due south at 1.2 miles per hour and the swimmer swims 3 miles per hour due east of the river, since their directions are perpendicular,  the resultant speed is the hypotenuse of the triangle formed by the two perpendicular directions.

The direction of the resultant speed is thus θ = tan⁻¹( vertical component/horizontal component) where vertical component = 1.2 mph due south = -1.2 mph and horizontal component = 3 mph due east = + 3 mph

So, θ = tan⁻¹(-1.2 mph/+ 3mph)

θ = tan⁻¹(-1.2/3)

θ = tan⁻¹(-0.4)

θ = -21.8°

θ = -21.8° + 360° (since we are in the fourth quadrant- between east and south)

θ = 338.2°

So, the swimmer must move in the direction 338.2°.

Answer:

9.) .784 . 10) 0.29

Step-by-step explanation:

Answer:

Solution given:

lowest =0

highest=11

the range in hours spent watching Netflix=

highest-lowest =11-0=

Range is 11.

Solution : here ,

lowest = 0

Highest = 11

the range in hours spent watching Netflix

=highest — lowest

= 11 —0

= 11

the range = 11

hope it is helpful to you

Answer:

0.4114 = 41.14% probability that he answers at most three of them are correct

Step-by-step explanation:

For each question, there are only two possible outcomes. Either it is answered correctly, or it is not. The probability of a question being answered correctly is independent of any other question. This means that the binomial probability distribution is used to solve this question.

Binomial probability distribution

The binomial probability is the probability of exactly x successes on n repeated trials, and X can only have two outcomes.

[tex]P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}[/tex]

In which [tex]C_{n,x}[/tex] is the number of different combinations of x objects from a set of n elements, given by the following formula.

[tex]C_{n,x} = \frac{n!}{x!(n-x)!}[/tex]

And p is the probability of X happening.

20 questions:

This means that [tex]n = 20[/tex]

Assume that each question has five possible choices, and only one of them is correct.

This means that [tex]p = \frac{1}{5} = 0.2[/tex]

What is the probability that he answers at most three of them are correct?

This is:

[tex]P(X \leq 3) = P(X = 0) + P(X = 1) + P(X = 2) + P(X = 3)[/tex]

So

[tex]P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}[/tex]

[tex]P(X = 0) = C_{20,0}.(0.2)^{0}.(0.8)^{20} = 0.0115[/tex]

[tex]P(X = 1) = C_{20,1}.(0.2)^{1}.(0.8)^{19} = 0.0576[/tex]

[tex]P(X = 2) = C_{20,2}.(0.2)^{2}.(0.8)^{18} = 0.1369[/tex]

[tex]P(X = 3) = C_{20,3}.(0.2)^{3}.(0.8)^{17} = 0.2054[/tex]

[tex]P(X \leq 3) = P(X = 0) + P(X = 1) + P(X = 2) + P(X = 3) = 0.0115 + 0.0576 + 0.1369 + 0.2054 = 0.4114[/tex]

0.4114 = 41.14% probability that he answers at most three of them are correct

The solution of system of equations is (5, 10)

Two or more expressions with an Equal sign is called as Equation.

The given system of equations are

y=2x ...(1)

y=x+5...(2)

Let us plug in equation 2 in equation 1

x+5=2x

Subtract x from both sides

x=5

Now plug in x value in equation 1

y=2×5

y=10

Hence, the solution of system of equations is (5, 10)

To learn more on Equation:

https://brainly.com/question/10413253

#SPJ7

Answer: = 6

Step-by-step explanation: Hope this help :D

9514 1404 393

Answer:

  C.  13

Step-by-step explanation:

Put 4 where y is in the equation and do the arithmetic.

  [tex]p(y)=\dfrac{4y}{2}+5\\\\p(4)=\dfrac{4(4)}{2}+5 = \dfrac{16}{2}+5=8+5\\\\\boxed{p(4)=13}[/tex]

35600000000000 (Maybe???)

Answer:

C and D

Step-by-step explanation:

So basically when u square -5 or +5, u get 25 either way

And since the square root of x is greater than or equal to 25, u can use both of them for answers.

Answer:

The statement is false.

Step-by-step explanation:

We know that all integer numbers can be written as a product of prime numbers.

For example:

15 = 5*3

15 is a product of two prime numbers, 5 and 3.

28 = 2*2*7

28 is the product of two prime numbers, 2 two times, and 7.

Now, we want to prove that in any set of 9 positive integers, some of them share all of their primary factors that are less than or equal to 5.

Now, let's try to find a counterexample to see if this is false.

The first idea that comes to mind is, what with a set of 9 positive prime numbers?

(2, 3, 5, 7, 11, 13, 17, 19, 23)

So none of these numbers share their primary factors (where the "1" is not considered as a primary factor)

And another counterexample could be:

(2, 3, 5, 7, 11, 13, 17, 6, 10)

Here 6 = 2*3

        10 = 2*5

So 6 and 10 share a primary factor (the two) but do not share all of their primary factors that are less than or equal to 5.

So we found two counterexamples of the statement, so we can conclude that the statement is false.

Answer:

C

Step-by-step explanation:

Take the coefficient of the linear term and divide it by 2

9/2

Then square it 81/4

That should either be added to the 11 or subtracted from the 15.

The answer is C

Answer:

[tex]4 \times 3 + 5 \\ = 12 + 5 \\ = 17 [/tex]

this is your answer

I hope it helps

have a nice day

#Captainpower

Answer:

4 x 3 = 12 + 5 = 17

Final answer 17

Step-by-step explanation:

Answer:

Step-by-step explanation:

the last answer looks good

There are 180 degrees in a triangle

4. 38+38= 76 degrees

180-76=104

Isosceles, Obtuse

5. 65+ x+x=65

Well we know one of the x

It is 90 degrees because it is a right angle

65+90=155

180-155=25

Scalene, Right triangle

6. 71+45= 116

180-116=64

7.  Scalene, acute

8. 126+22=148

180-148=32

Scalene, Obtuse

9. 50+90=140

180-140=40

Right angle,  Scalene

Please let me know if i got anything wrong