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4 years ago

How do i solve this?

Mathematics

1 answer:

Stells [14]4 years ago

7 0

You divide by 6 to each number then you get x by itself then x equals 10

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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

Find the difference. The answer should be in simplest form. −2/3 − 1/3 =

MakcuM [25]

Answer:

-1

Step-by-step explanation:

-2/3 - 1/3

Since the denominators are the same, we can combine the numerators

-3/3

Simplify

-1

5 0

3 years ago

What speed is a car traveling if it goes 240 miles in 4 hours? 60 miles per hour 40 miles per hour 80 miles per hour 30 miles

Lemur [1.5K]

Answer:

60 miles per hour

Step-by-step explanation:

Use speed = distance / time

Speed = 240 / 4

240 / 4 = 60

Speed = 60

8 0

3 years ago

Read 2 more answers

A tourist being chased by an angry bear is running in a straight line toward his car at a speed of 4.00 m/s. The car is a distan

enyata [817]

$S=\frac{d}{t},\ where\ s-speed,\ d-distance,\ t-time\\t=\frac{d}{S}\\\\d+37.2-bear\ distance\\\\Time\ (tourist\ tourist\ and\ bear)\ will\ be\ the\ same\ so\ we\\ should\ comparise\ them:\\\\\frac{d}{4}=\frac{d+37.2}{4.96}\\\\4.96d=4(d+37.2)\\\\4.96d=4d+148.8\\\\4.96d-4d=148.8\\\\0.96d=148.8\\\\d=155m\\\\Maximum\ value\ of\ d\ is\ 155m$

3 0

3 years ago

3+3+3+3+3 what is the product?

lukranit [14]

The correct answer is 15

7 0

3 years ago

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