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3 years ago

Your test grades are 78, 90, and86. What score on the fourth test will make your average test grade at least an 85?

Mathematics

1 answer:

arsen [322]3 years ago

6 0

Answer:

Step-by-step explanation:

78+90+86=246

246+94=340

340/4=85

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Can you please solve ax+z=w-y for a please???

Varvara68 [4.7K]

Answer:

$ax + z = w - y \\ ax = w - y - z \\ a = \frac{w - y - z}{x} \\ thank \: you \:$

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3 years ago

For a standard normal distribution, find the approximate value of p (negative 0.78 less-than-or-equal-to z less-than-or-equal-to

topjm [15]

The approximate value of P(-0.78 ≤ Z ≤ 1.16) is obtained being 0.6593

<h3>How to get the z scores?</h3>

If we've got a normal distribution, then we can convert it to standard normal distribution and its values will give us the z score.

If we have $X \sim N(\mu, \sigma)$

(X is following normal distribution with mean $\mu$ and standard deviation $\sigma$ )

then it can be converted to standard normal distribution as

$Z = \dfrac{X - \mu}{\sigma}, \\\\Z \sim N(0,1)$

(Know the fact that in continuous distribution, probability of a single point is 0, so we can write

$P(Z \leq z) = P(Z < z) )$

Also, know that if we look for Z = z in z-tables, the p-value we get is

$P(Z \leq z) = \rm p \: value$

For this case, we have to find:

$P(-0.78\leq Z \leq 1.16)$

It can be rewritten as:

$P(-0.78\leq Z \leq 1.16) = P(Z \leq 1.16) - P(Z < -0.78) \\P(-0.78\leq Z \leq 1.16) = P(Z \leq 1.16) - P(Z \leq -0.78)$

The p-values for Z = 1.16 and Z = -0.78 from the z-table is found as 0.8770 and 0.2177 respectively, and therefore, we get:

$P(-0.78\leq Z \leq 1.16) = P(Z \leq 1.16) - P(Z \leq -0.78)\\P(-0.78\leq Z \leq 1.16) = 0.8770 - 0.2177 = 0.6593$

Thus, the approximate value of P(-0.78 ≤ Z ≤ 1.16) is obtained being 0.6593

Learn more about z-score here:

brainly.com/question/21262765

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2 years ago

A house is 25 feet tall and a ladder is set up 35 feet away from the side of the house. approximately how long is the ladder fro

maks197457 [2]

Use Pythagorean Theorem of a^2 + b^2 = c^2 where a and b are the legs of the triangle set up by the house height and the ground, and c is the hypotenuse or how long the ladder is. C is going to be our unknown.

Just plugging in you get 25^2 + 35^2 = c^2. Simplify to 625 + 1225 = c^2. Simplify again to 1850 = c^2. The square root both sides to isolate the variable c. C = sqrt(1850) or approximately 43.0116 feet if rounded to 4 decimal places.

The ladder is approximately 43.0116 feet long.

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3 years ago

Which of the following is an example of an ordered pair: * M

prisoha [69]

Answer: B

Step-by-step explanation:

An ordered pair is another way of saying “point” or “coordinate”. Knowing that, we know A and C are expression and equation, respectively. We are left with B and D. We know that B is the correct answer because that is the proper way to write an ordered pair, or coordinate. Therefore, B is the answer.

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3 years ago

Need help pls. <br> B is a boat on a bearing of 60degrees what is the nearing from A to B.

Verizon [17]

Answer:

Step-by-step explanation:

the bearing of A from B is 065º. ... A boat sails from a

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3 years ago