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Elan Coil [88]
3 years ago
7

Vikki wants to determine whether students in her school would rather attend sporting event or a concert. Which would be the BEST

method for Vikki to produce a representative sample?
A. Randomly survey 50 students from each of the three grades at her school

B. Randomly survey 20 students from each of the three grades at her school

C. Randomly survey 50 students from her grade at her school

D. Randomly survey 50 students at her school
Mathematics
2 answers:
nevsk [136]3 years ago
7 0
Most likely ill go with D.
bija089 [108]3 years ago
3 0
B . in that way , she'd get a variety of age groups and stuff
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System of equations by substitution<br> how do this?<br> y= x+2<br> y= -4x+7
jekas [21]
Equations are given,
y= x+2
<span>
y= -4x+7

As you can see both the expressions, x+2 and -4x+7 are equal to "y". That means they are equal to each other too.

So let's equal them and solve it.

</span>x+2=-4x+7\\ \\ x+2+4x=7\\ \\ x+4x+2=7\\ \\ 5x+2=7\\ \\ 5x=7-2\\ \\ 5x=5\\ \\ x=\frac { 5 }{ 5 } \\ \\ x=1
<span>
Now we have x's value we will plug it in the first equation to find "y".

</span>x=1\\ \\ y=x+2\\ \\ y=1+2\\ \\ y=3
<span>
(1,3)</span>
8 0
3 years ago
Marcus has 1,525 marbles and divides the marbles into 15 bags to seal each bag. How many marbles are in each bag and how many ma
Dmitry_Shevchenko [17]

Answer:

There are 101 marbles in each bag and 10 marbles left over

Step-by-step explanation:

We can use the modulus to find out left over. The modulus is the remainder of the division from one number by another number. For example, 7 % 2 = 1. When you divide 7 by 2, division is 3 but the remainder is 1.

1525 % 15 = 10 marbles are left over

Now, we know that 1525 - 10 = 1515 marbles are equally put into each bag. That means each bag contains

1515 / 15 = 101 marbles

8 0
3 years ago
At a pet store, Davina counted 12 parrots out of 20 birds. Which is an equivalent ratio of parrots to birds at the pet store? 2:
Mazyrski [523]

Answer:

3 to 2

Hope it helps xD

3 0
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"Henri has calculated a z-test statistic of -2.73. What is the p-value of the test statistic? Answer choices are rounded to the
Novay_Z [31]

Answer:

0.003

Step-by-step explanation:

P-value = The value of probability.

P value can be defined are the probability of a given test statistic ( which could be z score, t score, f score) that is can be less than, equal to or greater than a given null hypothesis.

In the above question, the test statistic we are given = z score.

z score = -2.73

To find the P- value, we can make use of a z table for normal distribution.

Hence, P(z = -2.73) = 0.0031667

Approximately to the nearest thousandth = 0.003

7 0
3 years ago
3 friends want to go camping and they pack enough water to last for 6 days. Just as they are about to leave they are joined by 3
Neporo4naja [7]

Three friends want to go camping and they pack enough water to last for 6 days. Just as they are about to leave they are joined by 3 more people. How long will their water last now?

W 3 = 6 → W = 6 ∗ 3 = 18.

3 0
3 years ago
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