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
hram777 [196]
3 years ago
5

The mean number of words per minute (WPM) read by sixth graders is 81 with a standard deviation of 17 WPM. If 130 sixth graders

are randomly selected, what is the probability that the sample mean would be greater than 77.21 WPM? Round your answer to four decimal places.
Mathematics
1 answer:
ZanzabumX [31]3 years ago
3 0

Answer:

The probability that the sample mean would be greater than 77.21 WPM = 0.9945

Step-by-step explanation:

Mean number of Words per Minute  = u  = 81

Standard Deviation = s = 17

sample size = n = 130

Target value = x = 77.21

we can find the probability by converting <u>x</u> to z-score.

The formula for z-score = \frac{x-u}{\frac{s}{\sqrt{n} } }

using given values, z-score =  \frac{77.21-81}{\frac{17}{\sqrt{130} } }

=> -2.54

using the z table, we can find the find the probability of -2.54, that is 0.9945.

Therefore, the probability that the sample mean would be greater than 77.21 WPM = 0.9945  

You might be interested in
You buy a veido game for $60 and the sales tax is 8% what is the total cost for the game including the sales tax
Keith_Richards [23]
8% of 60 = 4.8
total = 60 + 4.8
= 64.8
5 0
3 years ago
Please Help Need this ASAP!!! The First and correct answer will be marked Brainlest!! Solve all 3 problems!!!!
Vanyuwa [196]

Answer:

4: y = 0.75x + 3.75

5: y = 0.75x + 23.25

6: y = 0.75x + 11

7 0
3 years ago
Read 2 more answers
Help me with question plz
rewona [7]

Answer:

41

Step-by-step explanation:

What I did was I took 180, 85 and 54 and subtracted them to get 41 if it is wrong i am so very sorry

7 0
3 years ago
Read 2 more answers
A rectangle is 5 meters longer than its width. If the length is shortened by 2 meters and width is increased by 1 meter, the are
Katarina [22]

Answer: Area = 6m²

              Smaller number = 16

              Hours = 9.6 h

Step-by-step explanation:

A rectangle is 5 meters longer than its width. If the length is shortened by 2 meters and width is increased by 1 meter, the area remains the same. Find the area of the rectangle.

1) w = x m                                2) w = x + 1 m

     l = x + 5  m                               l = x + 5 - 2 = x + 3 m

A₁ = A₂

A = w*l

A₁ = x(x+5) = x² + 5x

A₂ = (x+1)(x+2) = x² + x + 2x + 2 = x² + 3x + 2

A₁ = A₂

x² + 5x = x² + 3x + 2

5x - 3x = 2

2x = 2

x = 1

A₁ = x(x+5) = 1.6 = 6 m²

The ratio of two numbers is 2:5. If the larger number is 40, what is the smaller number.

<u> 2 </u> = <u> x </u>

5     40

5x = 80

x = 80/5 = 16

Sixteen construction workers can finish cementing a floor of a building in 3 hours. On a certain day, only 5 construction workers are available for the job. How long will it take the 5 construction workers to do the cementing job?

workers                      hours

    16                              3

     5                               x

↑                                          ↓              inversely proportional

<u> 5 </u> = <u> 3 </u>

16      x

5x = 16*3

5x = 48

x = 48/5

x = 9.6 h

 

6 0
3 years ago
PLEASE HELP IT IS DUE NOW!!!!<br> will give brainliest
vodomira [7]

Answer:

5.

2.4 = E

-1 4/5 = B

-0.2 =C

-2 3/5 = A

0.6 = D

6. one line under -1

Step-by-step explanation:

5. On the number line each short line is by 2 so basically 2 + 2 + 2

6. -4/3 = 1/1/3 (simplify)

4 0
3 years ago
Read 2 more answers
Other questions:
  • Can someone please help me with this!!<br>Will give brainliest!!
    9·1 answer
  • The directions: Write an equation in point-slope form of the line that passes through the given point and has the given slope m.
    10·1 answer
  • What's 40% of 40 please explain.
    8·2 answers
  • Three equivalent forms of a quadratic function are given. Select the form which reveals the zeros of f(x) without needing to alt
    12·1 answer
  • What is the absolute value of |-18|
    13·2 answers
  • F(x) = x2 – 7, and g(x) = 5 – x2 then g(f(-4)) =
    11·1 answer
  • Use the graph to estimate the selling price for a 4-year old car.
    6·1 answer
  • Prove that: cos^2 (45+A)+cos^2 (45-A)=1​
    11·2 answers
  • Hlpppppppppppppppppppppppppppppppppp
    12·2 answers
  • Calculate the mode of the data set {27, 33, 42, 26, 27, 41, 25, 40, 29). If there is no mode then state that.
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!