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
Dvinal [7]
3 years ago
9

Monthly sales of water heaters are normally distributed with a mean of 21 and a standard deviation of 5. What is the probability

of selling 12 water heaters or
less?
a) 3.59%
Ob) 1.8096
O c) 96.41%
O d) 8.45%
Mathematics
1 answer:
mina [271]3 years ago
4 0

Answer:

Option A: 3.59% is the correct answer

Step-by-step explanation:

Z-score is used to calculate the probabilities when mean and standard deviation is given.

Given

Mean = μ = 21

SD = σ = 5

We have to find the probability of selling 12 or less water heaters so our x value is 12

x = 12

The z-score of a value is calculated as:

z-score = (x-μ)/σ

Putting the values

z-score=\frac{12-21}{5} \\=\frac{-9}{5}\\=-1.8

Now z-score table will be used to calculate the probability for z= -1.8

So we will go for the row with -1.8 and column 0, which gives us: 0.03593

As we have to calculate the probability in percentage

=0.03593*100\\= 3.593\%

Hence,

Option A: 3.59% is the correct answer

You might be interested in
7. Holly plays pool on Sundays. She pays $6.50 for admission and $3.50 for
ollegr [7]

Answer:

3.50x+6.50=y

Step-by-step explanation:

6 0
2 years ago
Complete the square to determine the minimum or maximum value of the function defined by the expression.
FrozenT [24]

Answer:

Option D. minimum value at −38

Step-by-step explanation:

we have

x^{2}-12x-2

Let

y=x^{2}-12x-2

Complete the square

y+2=x^{2}-12x

y+2+36=(x^{2}-12x+36)

y+38=(x^{2}-12x+36)

y+38=(x-6)^{2}

y=(x-6)^{2}-38 ------> equation of a vertical parabola in vertex form

The vertex is the point (6,-38)

The parabola open upward-----> the vertex is a minimum

therefore

minimum value at −38

3 0
3 years ago
What is<br> (1/2)^2- 1/2 -6<br><br><br><br><br><br><br><br><br> .
N76 [4]

Answer:

-6.25 tI am not sure if this can help you but this is what I got

3 0
2 years ago
Which is an equation of the inverse of y=3/2x?
Elenna [48]

Answer:

y

=

3

2

x

Rewrite in slope-intercept form.

Tap for more steps...

y

=

3

2

x

Use the slope-intercept form to find the slope and y-intercept.

Tap for more steps...

Slope:  

3

2

y-intercept:  

(

0

,

0

)

Any line can be graphed using two points. Select two  

x

values, and plug them into the equation to find the corresponding  

y

values.

Tap for more steps...

x

y

0

0

2

3

Graph the line using the slope and the y-intercept, or the points.

Slope:  

3

2

y-intercept:  

(

0

,

0

)

x

y

0

0

2

3

image of graph

Step-by-step explanation:

7 0
3 years ago
A TV has a listed price of $579.95 before tax. If the sales tax rate is 7.75%, find the total cost of the TV with sales tax incl
kkurt [141]

To find the sales tax multiply the purchase price by the sales tax rate. Remember to convert the sales tax rate from a percent to a decimal number. Once the sales tax is calculated, it is added to the purchase price. The result is the total cost—this is what the customer pays.

6 0
2 years ago
Other questions:
  • 4t + 2 = 7t - 7<br><br> What is t?
    14·2 answers
  • Stephen evaluated (6.34 times 10 Superscript negative 7 Baseline) (4.5 times 10 Superscript 3 Baseline). His work is shown below
    9·2 answers
  • What value of x is in the solution set of 3(x – 4) &gt; 5x + 2?
    15·2 answers
  • Jacques built a house that measured 75 feet long by 30 feet wide.
    9·1 answer
  • 32 + (-2) -2 please help
    10·2 answers
  • The equation of line m is y=ax+b. Which could be the equation of line n? (ttm)​
    5·1 answer
  • A bat and a ball cost one dollar and ten cents in total. The bat costs a dollar more than the ball. How much does the ball cost?
    14·1 answer
  • Which student correctly translated the phrase "twice the sum of a number cubed and nine" and evaluated it for r = 3?
    10·2 answers
  • Use the drop-down menus to complete each equation so the statement about its solution is true. I’ll give brainliest :))
    9·1 answer
  • What ratio is 14:6 equal to
    13·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!