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
shtirl [24]
2 years ago
10

The mean number of words per minute (WPM) typed by a speed typist is 149 with a standard deviation of 14 WPM. What is the probab

ility that the sample mean would be greater than 147.8 WPM if 88 speed typists are randomly selected
Mathematics
1 answer:
Troyanec [42]2 years ago
6 0

Answer:

78.81%

Step-by-step explanation:

We are given;

Population mean; μ = 149

Sample mean; x¯ = 147.8

Sample size; n = 88

standard deviation; σ = 14

Z-score is;

z = (x¯ - μ)/(σ/√n)

Plugging in the relevant values;

z = (147.8 - 149)/(14/√88)

z = -0.804

From z-distribution table attached, we have; p = 0.21186

P(X > 147.8) = 1 - 0.21186 = 0.78814

In percentage gives; p = 78.81%

You might be interested in
What is 1(y), when y=-7/12?
Salsk061 [2.6K]

Answer: -7/12

Step-by-step explanation: an number multiplied by 1 is itself

6 0
3 years ago
Item 3
Kruka [31]

Answer:

The given  system as (3,3) as its solution.

Step-by-step explanation:

Here, the given system of the equation is:

4 x + 2 y = 18 ................  (1)

2 x + 3 y = 15      ...............  (2)

Now, to use the elimination method, w need to eliminate any of the variable.

Eliminate the variable x in the given system.

Multiply equation (2) with -2  we get,

(2 x + 3 y = 15  )(-2) ⇒ -4x - 6y = -30  .......  (3)

Add (1) and (3), we get:

4 x + 2 y   -4x - 6y    = 18  -30

or, - 4 y = - 12

or, y =  12/4 = 3    ⇒ y = 3

Putting in (1), we get

4x + 2(3)   = 18  or, 4x    = 18 - 6 = 12

or, x  = 3

(x,y)  = (3,3)

Hence, the above system as (3,3) as its solution.

6 0
3 years ago
Bill likes the outdoors, nature walking, and hunting deer and turkeys.
Lelechka [254]

Answer:

teacher got the answer physical theripists wrong on usatestprep

the naswer is teacher i promise it is teacher

Step-by-step explanation:

5 0
3 years ago
Which two values of x are roots of the polynomial below? x2 + 3x - 5
lesya692 [45]

Answer:

Step-by-step explanation:

The roots are the values of x for which x² + 3x - 5 = 0.

Quadratic formula:

x = [-3±√(3²-4(1)(-5))]/(2·1) = [-3±√29]/2

3 0
3 years ago
(1) Cos AcosecA=cot A​
Mashutka [201]

Answer:

The Basic Identities are :

cosec(A) =  \frac{1}{ \sin(A) }

\tan(A)  =  \frac{ \sin(A) }{ \cos(A) }

\cot(A)  =  \frac{1}{ \tan(A) }  =  \frac{ \cos(A) }{ \sin(A) }

So for this question :

\cos(A)cosec(A) =  \cot(A)

l.s.h =  \cos(A)  \times  \frac{1}{ \sin(A) }

l.s.h =  \frac{ \cos(A) }{ \sin(A) }

l.sh =  \cot(A)  \: (proven)

7 0
3 years ago
Other questions:
  • The sum of x and 25 is less than 75
    12·1 answer
  • How do I find the value of x?
    6·2 answers
  • Need help with some practice ​
    7·2 answers
  • What do patterns do you notice about finding the area of a triangle?
    6·2 answers
  • You pick a card at random, put it back, and then pick another card at random.
    5·2 answers
  • What is the expression in factored form?
    11·2 answers
  • Hi there- kinda confused on this
    6·2 answers
  • A carpenter lays 18 square feet of tiles in 2/3 of an hour. How many square feet of tile does the carpenter lay per hour?
    5·1 answer
  • A cone has a volume of 37.68cm3. If the height of the cone is 9cm what is the radius of the cone's
    8·1 answer
  • Please tell me the answer and explain
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!