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
NeX [460]
2 years ago
13

The average test scores in a physics class is normally distributed with a standard deviation of 5.4. 50 scores with a sample mea

n of 79 were selected at random.
(a) Find a 95% confidence interval for the population mean test score.

(b) What is the value of the margin of error?
Mathematics
1 answer:
andrey2020 [161]2 years ago
6 0

Answer:

to my knowledge

this question is gigantic

You might be interested in
The three sides of a triangle are 4cm, 6cm and 8cm.
yarga [219]

Answer:

In bold below.

Step-by-step explanation:

(a) The largest angle is opposite the largest side.

So by the Cosine Rule:

8^2 = 4^2 + 6^2 - 2*4*6 cos x

cos x =  (8^2 - 4^2 - 6^2) / (-2*4* 6)

= -0.25.

x = 104.48 degrees.

(b) Area of the triangle = 1/2 * 4 * 6 sin 104.48

= 11.62

= 3 √15.

(c)  The shortest altitude will have the longest sides as the base.

Area = 1/2 * altitude * base

3√15 = 1/2 * 8 * a

a = 3√15 / 4 cm

= 0.75√15 cm.

6 0
3 years ago
The graph shows the relationship between the total cost and the number of gift cards that Raj bought for raffle prizes.
BabaBlast [244]

<u>The problem is as following:</u>

The graph shows the relationship between the total cost and the number of gift cards that Raj bought for raffle prizes. What would be the cost for 5 of the gift cards? $80, $90, $100 Or $110

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

<u>Solution</u>:

The points of the figure represents a straight line

The general form of the straight line is  ⇒ y = mx + c

where m is the slope and c is constant

let x ⇒ The number of gifts cards , y ⇒ Total cost (in $)

we will find m and c using the points (1,20) , (2,40)

The slope = m = \frac{y_{2} - y_{1}}{x_{2}-x_{1}} =\frac{40-20}{2-1} =\frac{20}{1}=20

∴ y = 20x + c

Substitute with the point (1,20) ⇒ y = 20 at x = 1

∴ 20 = 20 * 1 + c

∴ 20 = 20 + c

∴ c = 0

∴ The equation of the line ⇒⇒⇒ y = 20x

To find the cost for 5 of the gift cards substitute with x = 5

∴ y = 20 * 5 = 100

So, the cost for 5 of the gift cards = $100

<u>The correct answer is option 3 ⇒⇒⇒ $100</u>

6 0
3 years ago
Read 2 more answers
100 and brainliest if you tell me ur favorite anime :]
Bad White [126]

Answer:

my fav anime is naruto :)

Step-by-step explanation:

3 0
3 years ago
Read 2 more answers
Please answer this correctly
marusya05 [52]

Answer:

662

Step-by-step explanation:

l x w

10x41

6x22

8x15

662

4 0
3 years ago
What is five more than twice a number in algebraic expression
Solnce55 [7]

Answer:

2x+5

Step-by-step explanation:

I'm sorry, but I don't know how to explain this. I hope it helps though.

6 0
3 years ago
Other questions:
  • What is the value of x?<br><br> x+<img src="https://tex.z-dn.net/?f=%5Cfrac%7B4%7D%7B5%7D" id="TexFormula1" title="\frac{4}{5}"
    11·1 answer
  • What fractions can be equivalent to - -1/-2
    5·1 answer
  • Suppose that rental company charges $5 and $10 per day for renting a riding lawn mower. If you create a linear function for the
    11·1 answer
  • Between what 2 consecutive integers does /191 lie
    7·1 answer
  • Point N lies on the line segment MP . The distance between points M and P is 24 cm, and the distance between points N and M is t
    10·1 answer
  • What is the LCM of 4 and 7 ?<br><br> Explain your answer
    14·1 answer
  • Question Progress
    15·1 answer
  • 60 students are in grade 1, but only 45 students are in
    8·1 answer
  • Pls help me asap!!!!!!
    15·1 answer
  • What is a severe limitation of using the Internet for primary research? The data on the Internet are usually outdated. The educa
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!