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
A. To find the slope and intercept of an equation, the equation must be in _________________ form.
deff fn [24]
1. Standard form
2.slope is 3/4
Y intercept is 0
7 0
3 years ago
The function f(x)= -1/4(x) +1 is getting closer to a particular number. Its initial values are 4 and -2, what happens to the val
Basile [38]

Answer:

After 10 iterations, the value is approximately the value it gets closer each time, which is 0.8 (or 4/5)

Step-by-step explanation:

If the inicial value is 4, we have:

1: f(4) = -1/4(4) + 1 = 0

2: f(0) = -1/4(0) + 1 = 1

3: f(1) = -1/4(1) + 1 = 3/4

4: f(3/4) = -1/4(3/4) + 1 = 13/16

5: f(13/16) = -1/4(13/16) + 1 = 51/64

6: f(51/64) = -1/4(51/64) + 1 = 205/256

7: f(205/256) = -1/4(205/256) + 1 = 819/1024

8: f(819/1024) = -1/4(819/1024) + 1 = 3277/4096

9: f(3277/4096) = -1/4(4) + 1 = 13107/16384

10: f(13107/16384) = -1/4(13107/16384) + 1 = 52429/65536 = 0.8

If the inicial value is -2, we have:

1: f(-2) = -1/4(-2) + 1 = 3/2

2: f(3/2) = -1/4(3/2) + 1 = 5/8

3: f(5/8) = -1/4(5/8) + 1 = 27/32

4: f(27/32) = -1/4(27/32) + 1 = 101/128

5: f(101/128) = -1/4(101/128) + 1 = 411/512

6: f(411/512) = -1/4(411/512) + 1 = 1637/2048

7: f(1637/2048) = -1/4(1637/2048) + 1 = 6555/8192

8: f(6555/8192) = -1/4(6555/8192) + 1 =  26213/32768

9: f(26213/32768) = -1/4(26213/32768) + 1 = 104859/131072

10: f(104859/131072) = -1/4(104859/131072) + 1 = 419429/524288 = 0.8

6 0
3 years ago
Pls help (pic above) 2 answers
True [87]

Answer:

Commutative property of multiplication/associative property of multiplication

3 0
3 years ago
What is between 0.33 0.34
Shtirlitz [24]
Before you write three numbers between 0.33 and 0.34 , you need to indicate whether you want rational numbers or real numbers (that is including irrational numbers).
6 0
3 years ago
Find the slope of the line that passes through the pair of points A(2,5) B(3,1)
nata0808 [166]

Answer:

The slope is -4

Step-by-step explanation:

slope = (y2-y1)/(x2-x1)

(1-5)/(3-2)

-4/1

-4

5 0
3 years ago
Read 2 more answers
Other questions:
  • How do you solve systems of equations using matrices? I need help with the steps please
    6·1 answer
  • You have an office building that is 600 square feet in area. What are two possible dimensions how your office could be construct
    11·1 answer
  • Find x. Round your answer to the nearest tenth of a degree.
    7·1 answer
  • Miriam ha a bag that contain 10 red marbles and 6 blue marbles . she chooses two marbles at random and does not replace them. Wh
    10·1 answer
  • Whats the least common denominator of 2/5 1/2 and 3/4?​
    14·1 answer
  • Write a problem that can be solved by skip counting on a number line
    6·2 answers
  • Bleacher seating for a concert on the fairgrounds consists of 6 sections. Each section seats 144 people. If 715 people attend th
    6·1 answer
  • 1. A company's daily profit, P, in dollars, is given by P(x) = 2x² +120x – 800, where x is the number of units produced per day.
    14·1 answer
  • Solve the equation:<br><br> 9x - 5 = 5x + 7
    6·2 answers
  • 3n *power 2 +10n+7 how to factories and pls tell with solution
    11·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!