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
RoseWind [281]
3 years ago
15

Students collected data about the capacities of their lungs by inflating balloons with a single breath. they measured the circum

ference of the balloons in centimeters. each student completed three trials and calculated the average. balloon circumference (cm) student trial 1 trial 2 trial 3 average 1 66.0 66.5 68.5 67.0 2 67.5 64.0 70.5 67.3 3 60.3 60.5 60.5 61.0 4 55.0 58.0 59.0 57.3 which student miscalculated her average? 1. student 1 2. student 2 3. student 3 4. student 4
Mathematics
2 answers:
Strike441 [17]3 years ago
6 0
The given data is the following:

Student Trial 1  Trial 2 Trial 3 Average
-----------  --------  --------  --------  ------------
    1           66.0    66.5   68.5     67.0
    2          67.5     64.0   70.5     67.3
    3          60.3     60.5   60.5    61.0
    4          55.0     58.0   59.0    57.3

Let us check the reported averages.
Student 1:
Average = (66.0 + 66.5 + 68.5)/3 = 67.0   Correct
Student 2:
Average = (67.5 + 64.0 + 70.5)/3 = 67.3    Correct
Student 3:
Average = (60.3 + 60.5 + 60.5)/3 = 604    Incorrect
Student 4:
Average = (55.0 + 58.0 + 59.0)/3 = 57.3    Correct

Answer: Student 3
tatyana61 [14]3 years ago
5 0
Look at the given data & calculate the average of each students data,

1) 66, 66.5, 68.5, 67
Average = \frac{66+66.5+68.5}{3} = 67 CORRECT

2) <span>67.5 64.0 70.5 67.3
</span>Average = \frac{67.5+64+70.5}{3} = 67.3 CORRECT

3) <span>60.3 60.5 60.5 61.0
</span>Average = \frac{60.3+60.5+60.5}{3} = 60.43 INCORRECT

4) <span>55.0 58.0 59.0 57.3
</span>Average = \frac{55+58+59}{3} = 57.3 CORRECT



Therefore, 3. Student 3 is the correct answer.

You might be interested in
Please help ASAP!! I'm in. a google meet rn and need to prove I got this question right
Aleks04 [339]

Answer:

x = 5.4

Step-by-step explanation:

(This question has already been answered, but both of the incorrect ones were deleted, so for future reference...)

Fig A is a scale image of Fig D. These two quadrilaterals are similar, and thus, the side lengths of corresponding sides are proportional. Set the proportion x/3 = 7.2/4 (you could alternatively write it as x/7.2 = 3/4 but for the simplicity's sake, and assuming anyone who has this problem would already know how to solve proportions like these...)

7.2/4 = 1.8

so

x/3 = 1.8

now multiply both sides by 3 to get x = 5.4

4 0
3 years ago
A metalworker has a metal alloy that is 15​% copper and another alloy that is 60​% copper. How many kilograms of each alloy shou
coldgirl [10]

18 kg of 15% copper and 72 kg of 60% copper should be combined by the metalworker to create 90 kg of 51% copper alloy.

<u>Step-by-step explanation:</u>

Let x = kg of 15% copper alloy

Let y = kg of 60% copper alloy

Since we need to create 90 kg of alloy we know:

x + y = 90

51% of 90 kg = 45.9 kg of copper

So we're interested in creating 45.9 kg of copper

We need some amount of 15% copper and some amount of 60% copper to create 45.9 kg of copper:

0.15x + 0.60y = 45.9

but

x + y = 90

x= 90 - y

substituting that value in for x

0.15(90 - y) + 0.60y = 45.9

13.5 - 0.15y + 0.60y = 45.9

0.45y = 32.4

y = 72

Substituting this y value to solve for x gives:

x + y = 90

x= 90-72

x=18

Therefore, in order to create 90kg of 51% alloy, we'd need 18 kg of 15% copper and 72 kg of 60% copper.

6 0
2 years ago
Find the value of f(9)<br> y = f(x)
goblinko [34]

f(9) is the x value, find where the line is in the y direction at x = 9

The line crosses y = 3 at x = 9

Answer:

f(9) = 3

8 0
2 years ago
Type the correct answer in each box. Use numerals instead of words.
Alex_Xolod [135]

Answer:


Step-by-step explanation:

Given that prices for a pair of shoes lie in the interval

[80,180] dollars.

Delivery fee 20% of price.  

i.e. delivery fee will be in the interval [4, 9]

(1/20th of price)

Total cost= price of shoedelivery cost

Hence f(c) = c+c/20 = 21c/20

The domain of this function would be c lying between 80 to 180

So domain =[80,180]

---------------------------------

Amount to be repaid = 42 dollars

Once he received this amount, the price would be

105+42 =147

But since price range is only [21*80/20, 21*180/20]

=[84, 189]

Since now Albert has 147 dollars, he can afford is

[80,147]




6 0
3 years ago
Read 2 more answers
How to find the discriminant of
Sonbull [250]

the discriminant   b^2 - 4ac when the equation is in the form of ax^2 +bx+c=0

13x^2-16x = x^2 -x

we need to get in it the standard form

subtract x^2 from each side

12x^2 -16x = -x

add x to each side

12x^2 -15x = 0

12x^2 -15x -0 =0

a=12 b=-15 c=0

b^2 -4ac

the discriminant = b^2

b^2 = (-15)2 = 225


5 0
3 years ago
Other questions:
  • Kamal’s bedroom has an area of 120 square feet. The width of the room is 5/6 the length of the room. What are the dimensions of
    11·1 answer
  • Manuel has collected coupons for various items at the grocery store. Some of the coupons are for 50¢ off, and some of them are f
    5·1 answer
  • Multiple the following:
    11·2 answers
  • Which of the following are roots of the polynomial function? Check all that apply.
    15·1 answer
  • What are the three ways to describe a relation?
    9·2 answers
  • Which of the following are the equations for the parent function and the transformed parent function represented by the graph?
    15·1 answer
  • The amount of icing on a Cuppie Cake large cupcake follows a Normal distribution, with a mean of 2 ounces and a standard deviati
    11·1 answer
  • 31 x 8,203<br> Aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
    11·2 answers
  • Which of the following describes a simple event?
    6·1 answer
  • Which of the following is an equation of a line parallel to the equationy = 4x+1?O A. y = x-2y =X-24B. y = -4x-2O c. y = 4x - 2y
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!