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3 years ago

I need help with this question

Mathematics

1 answer:

Oliga [24]3 years ago

4 0

Answer:

-14.50, -8/4, 4.2, 15/2, 12.072, 12.25

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Algebra applications: find the value of x and y

strojnjashka [21]

Answer:

x = 10°

y = 35°

Step-by-step explanation:

9x + 20 + 7x = 180 (supplementary angles)

16x = 180 - 20

16x = 160

x = 10°

2y = 7x ( opposite angles)

2y = 70

y = 35°

5 0

4 years ago

A distribution of scores for a test of life stressors has a mean of µ = 125 and standard deviation of σ = 15. The researcher cal

laila [671]

Answer:

The mean and standard deviation for the z-scores in this distribution are 0 and 1 respectively.

Step-by-step explanation:

Let the random variable X follow a Normal distribution with mean μ and standard deviation σ.

The z-scores are standardized form of the raw scores X. It is computed by subtracting the mean (μ) from the raw score x and dividing the result by the standard deviation (σ).

$z=\frac{x-\mu}{\sigma}$

These z-scores also follow a normal distribution.

The mean is:

$E(z)=E[\frac{x-\mu}{\sigma} ]=\frac{1}{\sigma}\times [E(x)-\mu] =\frac{1}{\sigma}\times [\mu-\mu]=0$

The standard deviation is:

$Var(z)=Var[\frac{x-\mu}{\sigma} ]=\frac{1}{\sigma^{2}}\times [Var(x)-Var(\mu)] =\frac{\sigma^{2}-0}{\sigma^{2}}=1\\SD(z)=\sqrt{Var(z)}=1$

Thus, the mean and standard deviation for the z-scores in this distribution are 0 and 1 respectively.

8 0

3 years ago

I need help and fast plz can someone help me

nikdorinn [45]

Answer:

Try D because a number times 10 to the power of anything is not that number!

Step-by-step explanation:

6 0

3 years ago

Betty walks her neighbor's dog for $25 a week. If she walks the dog twice a day, how much does she make each time she walks the

abruzzese [7]

Answer:

$350

Step-by-step explanation: There are 7 days in a week- if she walks the dog two times in a day, that would be 14 times $25. The answer would be $350.

3 0

3 years ago

Read 2 more answers

Can someone help me with this? I’ll give brainliest if you answer.

djverab [1.8K]

Answer: yes, they are congruent they are just rotated

Step-by-step explanation:

8 0

3 years ago