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Gnom [1K]
4 years ago
14

Example 2: Representative Sample

Mathematics
1 answer:
lions [1.4K]4 years ago
6 0

Answer:

The correct answer is b. Assign every student in the senior class a number from 1 to 314. Then, use a random number generator to select 30 students to poll.

Step-by-step explanation:

You will want that the sample you choose represents the total population, you can do it by random sampling and it requires an unbiased form of collecting data, in which every person has the same opportunity of being chosen.

The correct answer is b. Assign every student in the senior class a number from 1 to 314. Then, use a random number generator to select 30 students to poll, because it uses a random process to select the sample.

a. Poll everyone in your friend’s math class, is not the correct answer because the class is too large and it will take a lot of time and effort to ask everyboydy.

c. Ask every student who is going through the lunch line in the cafeteria who they will vote for, is not the correct answer because it is not a random process because the people in the luch line are similar and migth share opinions.

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Two numbers have prime factorizations of 2^2 x 3^2 x 5 and 2 x 3 x 5. Which expression can be used to find their least common mu
likoan [24]

Answer:  2^2 x 3^2 x 5

You can use a star symbol * in place of the x symbols.

==================================================

Explanation:

We simply circle the primes where they have the largest exponent.

The unique primes listed here are: 2, 3, 5

  • The prime 2 has the highest exponent of 2, meaning 2^2 is part of the answer.
  • The prime 3 has the highest exponent of 2, meaning 3^2 is also part of the LCM
  • The prime 5, without any exponent, is also part of the LCM. We can write this as 5^1 or just leave it as 5.
7 0
3 years ago
Sasha went shopping and decided to purchase a set of bracelets for 5% off the regular price ($44.00). If Sasha buys the bracelet
scZoUnD [109]

Answer:

answer should be #31.35

hope this helps :)

5 0
3 years ago
An African elephant weighed 209 lbs when it was born. Baby elephants gain an average of 38 lbs per week.
agasfer [191]

Answer:

Part A: W= (1197- 209)/ 38

Part B: 26 Weeks

Step-by-step explanation:

Part A:

We first need to subtract the 209lbs from the goal of 1197lbs. Now we have how many pounds we need to gain. Then we need to divide it by how many pounds we are gaining a week. Now we have how many weeks it will take

Part B:

W= (1197- 209)/ 38

W= 988/ 38

W= 26

7 0
3 years ago
Add.<br> 3/x+4 + 6/x+5<br><br> also show your work thank u ♡
forsale [732]

Answer:

hope this helped, i just took a test on this

7 0
4 years ago
Representar las rectas a, b y c y determinar si son paralelas (o perpendiculares) dos a dos. A: y=−3x+5 | b: y =x/3+2 | c: y=−3x
Anettt [7]

Answer:

A y C: paralelas

B y A: perpendiculares

B y C: perpendiculares.

Step-by-step explanation:

Sea una recta:

f(x) = a*x + b

Donde a es la pendiente y b es la ordenada al origen.

Otra recta va a ser paralela a esta si tiene la misma pendiente, pero una diferente ordenada al origen, por ejemplo:

g(x) = a*x + c

Y una recta perpendicular a f(x) tendría una pendiente p = -(1/a)

Entonces podemos escribir la línea perpendicular a f(x) como:

h(x) = -(1/a)*x + c

Ahora veamos nuestras líneas:

A(x) =  y = −3*x+5

B(x) = y = x/3+2 = (1/3)*x + 2

C(x) = y = -3*x + 1

Primero veamos cuáles son paralelas:

A(x) y C(x) tienen la misma pendiente (-3) y diferente ordenada al origen, entonces  A y C son paralelas.

Sabiendo que la pendiente de A y C es -3, una línea perpendicular a esta tendría una pendiente:

-(1/-3) = 1/3

Que es justamente la pendiente que tiene la línea B, entonces podemos concluir que B es perpendicular a las líneas A y C.

A y C: paralelas

B y A: perpendiculares

B y C: perpendiculares.

7 0
3 years ago
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