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asambeis [7]
3 years ago
10

On a standardized exam, the scores are normally distributed with a mean of 27 and a standard deviation of 4. Find the z-score of

a person who scored 17 on the exam.
Mathematics
1 answer:
Nata [24]3 years ago
7 0

Answer:

The answer is "-2.5"

Step-by-step explanation:

Given:

\mu=27\\\\\sigma=4\\\\x=17\\\\z = \frac{(x-\mu)}{\sigma} \\\\

   = \frac{(17-27)}{4}\\\\= \frac{-10}{4}\\\\=-2.5

You might be interested in
Evaluate y5 + x(-7)<br> When x = 2, y = -5
Ymorist [56]

Answer:

45

Step-by-step explanation:

OK, first we turn the variables into into the actual values:

The equation will look like this:

(2)5 + (-5)(-7)

Now its easier to solve!  Lets solve (2)5!

2 * 5 = 10

The equation looks like:

10 + (-5)(-7)  

We will also solve (-5)(-7). Remember that a negative number times a negative number is positive!

-5 * -7 = 35

Lets finish the rest:

10 + 35 = 45.          

Hope this is correct and have a nice day!      

3 0
4 years ago
9)
Eddi Din [679]

Answer:

.5 pounds

Step-by-step explanation:

3 divided by 6  is .5

7 0
3 years ago
Please Help !! <br>The picture of the question is attached. ​
kirza4 [7]

Answer:

x = 90°

Step-by-step explanation:

Using the identity

cos²x = 1 - sin²x

Given

cos²x - sin x + 1 = 0

1 - sin²x - sin x + 1 = 0

- sin²x - sin x + 2 = 0 ← quadratic equation in sin x ( multiply through by - 1 )

sin²x + sin x - 2 = 0 ← in standard form

(sinx + 2)(sinx - 1) = 0 ← in factored form

Equate each factor to zero and solve for x

sinx + 2 = 0 ⇒ sinx = - 2 ← has no solution as - 1 ≤ x ≤ 1

sinx - 1 = 0 ⇒ sinx = 1 ⇒ x = 90°

solution is x = 90°

3 0
3 years ago
AB is tangent to the circle at B. M∠A=40 and mBC=130. <br> a. Find x <br> b. Find y
soldi70 [24.7K]

The values for x and y are respectively given as

  • x = 50
  • y= 90

This is further explained below.

<h3>What is the values for x and y ?</h3>

Generally, the equation for secent  is  mathematically given as

secent = \frac{big arc - small arc}{2}

Therefore

40 = \frac{130-x}{2}

80 = 130-x

x = 50

b) To Solve for y Now we find a measure of arc CD

ArcCD = 360-130-50

ArcCD = 180

In conclusion,(1/2) of the arc measure is equal to the angle that is on and inside a circle.

y = 180/2

y= 90

Read more about circle

brainly.com/question/11833983

#SPJ1

3 0
2 years ago
165 calories are from sugar and 250 are in the candy bar, what percent of calories are just from sugar
vova2212 [387]

Answer:

66%

Step-by-step explanation:

The method I use is putting 0/100 and 165/250 side by side. You multiply 100×165 and then divide that by 250.

So 16,500 ÷ 250 = 66

7 0
3 years ago
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