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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%

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It takes Three hours for a highway worker to mow the grass on a stretch of highway. It takes 6 hours for a different highway wor
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7 0
3 years ago
Quasim ordered 32 cases with 28 cans of fruit in each case. He also received 24 cases with 13 large cans of fruit in each case.
klasskru [66]
I am assuming the 32 cases contain the small cans...

32 cases...with 28 small cans of fruit in each case..
32 * 28 = 896 small cans of fruit in total

24 cases...with 13 large cans of fruit in each case...
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so there are (896 - 312) = 584 more small cans then large cans <==
8 0
3 years ago
How do u rewrite 0.72 repeating as a simplified fraction?
vampirchik [111]
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When dividing by 11 the numerator will be one more than the first number in the decimal
8 0
3 years ago
Pastries made out of filo dough and brushed with either olive oil or butter (but not both). Pastries made out of shortcrust doug
Genrish500 [490]

Answer:

\frac{9x}{40} is the answer.

Step-by-step explanation:

The question has some typo errors.

Rashid and Mikhail submitted a total of x pastries to a baking competition.

Suppose say :

Mikhail made x pastries .

Hence Rashid made \frac{2x}{3} pastries.

And in total they made \frac{5x}{3} pastries.

Now we have that out of x, \frac{5}{8} of x were brushed with olive oil.

So, \frac{3}{8} of x that is \frac{3x}{8} are brushed by butter.

So, it becomes (\frac{3}{8}) / ( \frac{5x}{3} )

= \frac{3}{8} \times\frac{3x}{5} = \frac{9x}{40}

Hence, answer is option B.

6 0
3 years ago
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