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]
2 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]2 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
Please someone help me out. I beggggg
bezimeni [28]

Answer:

1.  144  2. 16 3. 1   4. 3x-6  

Step-by-step explanation:

So think of this as a function in a function.  So you work from the inside to the outside.  So for problem 1, we start with f(4)) [you read it "f of 4"] so what is the solution when x = 4, since f(x) means the function of x so f(4) means 'the function of 4' inside f(x).  

Since f(x) = 3x then f(4) = 3(4) [notice how you substitute the 4 everywhere you see a letter x]

so f(4) = 12, now you work the next part h(f(4)) since f(4)=12 then h(12)

So take the h(x) function which is h(x) = x^{2} then h(12) = 12^{2} so h(12) = 144

4 0
2 years ago
Give the most descriptive name for
Ipatiy [6.2K]

Answer:

trapezium................

8 0
3 years ago
Which shows the expressions rewritten with the least common denominator?
baherus [9]

Answer:

  D.  (14x-4)/(8x^2) and (x^2-x)/(8x^2)

Step-by-step explanation:

The least common denominator will be 8x^2, the product of 2 and x to the highest of their powers in either of the denominators.

  \left\{\dfrac{7x-2}{4x^2},\ \dfrac{x-1}{8x}\right\}=\left\{\dfrac{7x-2}{4x^2}\cdot\dfrac{2}{2},\ \dfrac{x-1}{8x}\cdot\dfrac{x}{x}\right\}\\\\=\left\{\dfrac{14x-4}{8x^2},\ \dfrac{x^2-x}{8x^2}\right\}

7 0
2 years ago
The slope of the graph below is:​
Paladinen [302]

Answer:

Step-by-step explanation:

i know u do rise over run so that will give you uor answer

im not very smart when it comes to math

sorry i couldnt help

3 0
2 years ago
Help with these questions ​
love history [14]

Answer: a) -27, b) 35, c) 14

Step-by-step explanation:

a) When a positive number is multiplied by a negative number, your answer is negative, and since we know that 9 × 3 = 27, and that this figure has to be negative (since 9 is negative), the answer is -27.

b) Multiplying two negative numbers gives a positive number, and since 7 × 5 = 35, the answer is positive 35 (as both 7 and 5 in the original question are negative).

c) Follows just like b.

8 0
3 years ago
Other questions:
  • Simplify the numerical expression: 4(3)+5(6+1)
    8·1 answer
  • Can someone answer the 2 questions in the picture i really need help
    7·1 answer
  • URGENT!!! 100PTS!!!
    9·2 answers
  • How can you know if this equation is true 1/3+1/5=2/8=1/4
    14·2 answers
  • Nico had 9 words correct on his weekly spelling test. This is 1 less than what
    15·2 answers
  • Write an equation with the given point and slope.<br> Through (-1,7) and m = -3
    13·1 answer
  • Many states have a meal tax that is proportional
    13·2 answers
  • What is the domain and range pls help ASAP thank you
    5·1 answer
  • alex has 3 bags with the same amount of marbles in them, totaling 12 marbles. kirian has 3 bags with the same amount in them tot
    14·1 answer
  • How many groups of 2/3 are in 3/5
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!