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
Zielflug [23.3K]
3 years ago
13

The mean height of a sample of 15-year-old boys is 175 centimeters, with a standard deviation of 10. For a sample of 15-year-old

girls, the mean is 165 centimeters with a standard deviation of 8.
If 8 boys and 8 girls were sampled, the standard deviation of the difference is? ( round to the nearest hundredth).
Mathematics
1 answer:
Alina [70]3 years ago
4 0
The equation for standard deviation is finding the mean of the numbers, subtracting each of the initial numbers by the mean, squaring each of the results, finding the mean of these results added together, then finding out the square root of the results added together.

The mean of 175 and 165 is 170, subtract 175 and 165 by 170, and you get 5 and -5 respectively. Then, square the results and you get 25 and 25.

Add the two numbers together (25 & 25) then find the square root of it, which is <span>7.07106781187, simplified to 7.07.</span>
You might be interested in
The length of the hypotenuse of a right triangle is 15 in. and one leg has length of 6 in. Find the length of the other leg.
liq [111]

Answer:

square root 189 i did the math and google says the same

Step-by-step explanation:

5 0
3 years ago
Read 2 more answers
PQR is a right-angled triangle. PQ = 16 cm. PR = 8 cm. Calculate the length of
vlada-n [284]
SOLUTION:

PQR is a right-angle triangle.

Therefore, to solve this problem, we will use Pythagoras theorem which is only applicable to right-angle triangles.

Pythagoras theorem is as displayed below:

a^2 + b^2 = c^2

Where c = hypotenuse of right-angle triangle

Where a and b = other two sides of right-angle triangle

Now we will simply substitute the values from the problem into Pythagoras theorem in order to obtain the length of QR.

c = PQ = 16cm

a = PR = 8cm

b = QR = ?

a^2 + b^2 = c^2

( 8 )^2 + b^2 = ( 16 )^2

64 + b^2 = 256

b^2 = 256 - 64

b^2 = 192

b = square root of ( 192 )

b = 13.8564...

b = 13.86 ( to 2 decimal places )

FINAL ANSWER:

Therefore, the length of QR is 13.86 centimetres to 2 decimal places.

Hope this helps! :)
Have a lovely day! <3
8 0
3 years ago
What is the equation of this trend line?
solmaris [256]

Equation of this line is K = -2J + 28

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

Step 1:

The equation can be written in slope intercept form which is y = mx + b

Step 2:

Calculate slope of the line, m = (y2 - y1)/(x2 - x1)

⇒ m = (24 - 20)/(2 - 4) = 4/-2) = -2

Step 3:

Find y-intercept of the line

⇒ b = 28

Step 4:

Substitute values in the equation

⇒ K = -2J + 28

5 0
3 years ago
Name at least one advantage of credit cards.
vaieri [72.5K]
You are able to pay expensive dues forward, such as houses, cars, and other payments that you wouldn't be able to pay in full on the spot.
3 0
3 years ago
Read 2 more answers
Christina biked 36 miles 6 in hours if she biked at the constant speed how many miles did she ride in 1 hour
Nesterboy [21]

find unit rate:

36 / 6 = 6

she can ride 6 miles in 1 hour

5 0
3 years ago
Read 2 more answers
Other questions:
  • The larger of two consecutive ODD numbers is one less than twice the smaller number. Find the larger of the two numbers.
    5·1 answer
  • The sum of -3 1/3b + b
    12·1 answer
  • classify the triangle by its angles and its sides. explain how you knew which classifications to use
    8·1 answer
  • The circle shown has a radius of 4 cm.<br> What is the length of the diameter of the circle?<br> cm
    14·2 answers
  • What is another name for 23 ten thousands?
    6·1 answer
  • Find the distance between the two points rounding to the nearest tenth (if necessary). (-6,7) and (-3,0)​
    15·1 answer
  • Help! Give brainliest!
    10·2 answers
  • 4/9b (with an exponent of 6)
    11·1 answer
  • Plssss answer… for math
    11·2 answers
  • 2. A light fixture contains 6 light bulbs. With normal use, each bulb has a 0.85
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!