1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Fittoniya [83]
3 years ago
8

-

qr\sqrt4-x +\sqrt{4-x" align="absmiddle" class="latex-formula">
Mathematics
1 answer:
tankabanditka [31]3 years ago
8 0

-2-x+\sqrt{-x+4}

You might be interested in
I need help on B and C. Not sure how I can solve those. Can someone please help me out here? Thank you for your help!
Valentin [98]

Nice job with part A on getting those correct answers.

====================================================

Part B

  • mu = mean = 43
  • sigma = standard deviation = 3

Let's calculate the z score for the raw score x = 37

z = (x - mu)/sigma

z = (37 - 43)/3

z = -6/3

z = -2

A negative z score tells us we're below the mean. Specifically, we are exactly 2 standard deviations under the mean.

If you repeat those steps for x = 46 (not changing mu or sigma), then you should get z = 1. So we're now 1 standard deviation above the mean.

Ultimately, we want to know the area under the standard normal curve (aka z curve) from z = -2 to z = 1.

Refer to the chart below which is a breakdown of the Empirical Rule. The pink areas are within 1 standard deviation of the mean. We have two regions taking up roughly 34% of the full area under the curve, so they combine to 34+34 = 68%

Then we add on another 13.5% which is the blue area on the left (between z = -2 and z = -1)

So 13.5+68 = 81.5% of the area under the curve is between z = -2 and z = 1.

<h3>Answer: 81.5</h3>

Note: the percent sign is already taken care of for us, so there's no need to type it in. But the answer above of course means 81.5% and that answer is approximate.

====================================================

Part C

Let's find the z score for x = 34. The values of mu and sigma are the same as before.

z = (x - mu)/sigma

z = (34-43)/3

z = -9/3

z = -3

So computing P(X > 34) is the same as P(Z > -3)

Notice how adding up all of the values in the chart mentioned gets us:

2.35+13.5+34+34+13.5+2.35 = 99.7

which means 99.7% of the distribution is within 3 standard deviations of the mean. The remaining 100% - 99.7% = 0.3% is the combined area of both tails. So each tail is (0.3%)/2 = 0.15%

In short, 0.15% of the area under the curve is to the left of z = -3

Therefore, 100% - 0.15% = 99.85% of the widgets are going to have z values larger than -3, which in turn means they have values larger than 34.

<h3>Answer: 99.85</h3>

Again you don't have to worry about the percent sign. Like before, the answer is approximate.

5 0
2 years ago
The mean is μ = 15.2 and the standard deviation is σ = 0.9. find the probability that x is greater than 17.
Vlad1618 [11]
The probability that x >17 will be found as follows:
the z-score is given by:
z=(17-15.2)/0.9=2
Thus
P(X>17)=1-P(x<17)=P-(z=2)
=1-0.9772
=0.0228

8 0
3 years ago
Read 2 more answers
I need help please! I will mark you as a brainlest and give out 30 points!
klio [65]
Answer:
1entire group
2part
3particular condition
4random and large enough
5range of the middle half
6
7
8
9 average
10middle of a sorted list
11which appears more often
12 the lowest and highest
13mirrors
14
15

Step-by-step explanation:
Im not sure about the rest
3 0
2 years ago
On a map, the length of a nature trail is 7.2 centimeters. If the scale is 1 centimeter to 25 kilometers, what is the actual len
Lisa [10]
A:b=c:d
7.2:x=1:25. If u see two ratios equal each other, the product of a and d is equal to the product of b and c. This means that (7.2 times 25) is equal to x. This equals 180=x. The actual distance of the trail of 180 km. Hope this helps!
7 0
2 years ago
Decide if the function is an exponential function. If it is, state the initial value and the base. (5 points)
Irina18 [472]

Answer:

Exponential Function; base = 7; initial value = - 9.3

Step-by-step explanation:

Base is a number/value which has a variable exponent;

Initial value is the value of a function (i.e. y) when the independent variable, i.e. x, is equal to 0.

4 0
3 years ago
Other questions:
  • Which shows the mean, median, mode, and range for this set of data?
    12·1 answer
  • Inline skates are on sale for 35% off the regular price
    6·1 answer
  • In three math tests, you have scored 91,95 and 88 points. You are about to take your next test. Suppose you want to have an aver
    7·2 answers
  • Quadrilateral EFGH has coordinates E(2b, 2b), F(3b, b), G(b, o), and H(0, 0). Find the midpoint of HE. Help me!
    5·2 answers
  • 1.
    5·1 answer
  • Assume that the significance level is alpha = 0.01. Use the given information to find the​ P-value and the critical​ value(s). T
    11·1 answer
  • If U work overtime you will received and half for every hour over 40 hours I want to make an extra $300 by working overtime I ne
    12·1 answer
  • Find the length of DF
    11·1 answer
  • PLEASE PLEASE HELP ME WITH THIS I HAVE NO IDEA HOW TO DO IT
    12·1 answer
  • A triangle can have sides whose lengths are 9cm, 16 cm, and
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!