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
Sladkaya [172]
3 years ago
12

A recent survey was conducted to compare the cost of solar energy to the cost of gas or electric energy. Results of the survey r

evealed that the distribution of the amount of the monthly utility bill of a 3-bedroom house using gas or electric energy had a mean of $97 and a standard deviation of $12. If nothing is known about the shape of the distribution, what percentage of homes will have a monthly utility bill of less than $73?
a)at least 75%

b)at most 25%

c)at most 11.1%

d)at least 88.9%
Mathematics
1 answer:
Mariana [72]3 years ago
4 0

Answer:

c) at most 11.1%

Step-by-step explanation:

We have the data that is 97 ± 12, with 97 being the mean and 12 the standard deviation.

Now, the percentage of people who reached them for less than 73 dollars, if it were a normal distribution:

z = (73 - 97) / 12 = - 2

so it would be, a probability of 0.0228 or 0.228%.

But we don't know what distribution it has, but we can get an idea.

A and D discarded, as they are very high values, and 73 is well below the average.

B) is still a very high value.

Therefore the answer is C, at most 11.1%

You might be interested in
9x²+bx+100 as a perfect square​
jok3333 [9.3K]

Step-by-step explanation:

9x²+bx+ 100

(3x)²+ bx + 10²

(3x)² + 10² + bx

(3x)² + 10² + bx

3 0
3 years ago
How many solutions are there to the system of equations? StartLayout enlarged left-brace 1st row 4 x minus 5 y = 5 2nd row negat
kkurt [141]

Answer:

Only one solution  x=\frac{5}{4},y=0

Step-by-step explanation:

4x-5y=5..............(1)\\0.08x+0.10y=0.10...........(2)

Multiply equation (2) by 50

4x-5y=5........(3)

Now from equation (1)+ equation(3)

8x=10\\x=\frac{10}{8}\\x=\frac{5}{4}

Put the value in equation (1)

5-5y=5\\5y=0\\y=0

hence only one solution exists\left(\frac{5}{4},0\right).

3 0
3 years ago
Read 2 more answers
Using the greatest common factor 4/9 x 3/8
KIM [24]

Answer:

1/6

Step-by-step explanation:

4/9&3/8

4/9x3/8= ?

Multiply both numerators

= 4 x 3

= 12

Multiply both denominators

= 9 x 8

= 72

Use above values of step 2 & 3, and rewrite as below

= 12/72

so, 12/72 is equivalent to the fraction for 4/9 times of 3/8, and its simplified form is 1/6.

4 0
3 years ago
the larger of two numbers is 10 less than twice the smaller number, if the sum of two number is 38,find the two numbers
g100num [7]

Answer:

2numbers of tens and need to be the best

5 0
3 years ago
Please helpp! I will mark Brainliest!
leva [86]

Do you mind typing the equation it looks incomplete.

7 0
3 years ago
Read 2 more answers
Other questions:
  • A regular polygon of 2 k + 1 sides has 140 as<br> size of each interior angle find K​
    8·1 answer
  • Please please answer this correctly. Please take a pic of the same screenshot of put the right plots correctly
    15·1 answer
  • Margaret drank 1/6 of a 36oz. bottle of soda. She gives the
    5·1 answer
  • Circle M is shown. Line segments J L and H K are diameters that intersect at center point M. Angle K M L is 25 degrees.
    12·1 answer
  • If there are 16 ounces in one pound than how many ounces are there in a half pound?
    13·2 answers
  • Anyone please answer !!!!! Happy holidays!
    5·2 answers
  • Player A scored -2. player B scored +4. what was the difference?
    8·1 answer
  • I need the answer pls
    12·1 answer
  • 3/√3 how to get final answer?<br><br> Is it like this <br> 3=√3*√3<br><br> And <br> √3*√3/√3= √3
    15·2 answers
  • How do I find the domain range and function of the graph
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!