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Dmitriy789 [7]
4 years ago
13

Samara has an assignment to conduct a survey. She wants to find out what students like to do after school. She asks the first 10

people she sees in her Book Club what they like to do after school. Which statement correctly explains whether Samara's sample is a random sample?
A.Samara’s sample is not random because she only asks 10 people.
B.Samara's sample is random because she asks each person the same question.
C.Samara’s sample is random because she asks the first 10 people she sees.
D.Samara’s sample is not random because she only asks people in a book club
Mathematics
2 answers:
Sliva [168]4 years ago
7 0
C: Because she doesn't choose certain people
Romashka-Z-Leto [24]4 years ago
6 0
Answer D because if she wanted real results, then she would ask 10 people she saw in the whole school instead of just the book club
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A researcher wishes to conduct a study of the color preferences of new car buyers. Suppose that 50% of this population prefers t
ehidna [41]

Answer:

The probability that more than a third of the buyers would prefer brown is 0.8491.

Step-by-step explanation:

This is binomial problem with n=15 and p=0.50.

The binomial formula of probaility is:

P(X=x)=\frac{n!}{x!(n-x)!} p^{x} (1-p)^{n-x}

More than a third of the buyers: 15÷3=5

We have to find P(x>5).

P(x>5) = 1 - P(x≤5) = 1 - P(x=0) - P(x=1) - P(x=2) - P(x=3) - P(x=4) - P(x=5)

P(x=0)=\frac{15!}{0!15!} (0.5)^{0} (1-0.5)^{15}=0.00003

P(x=1)=\frac{15!}{1!14!} (0.5)^{1} (1-0.5)^{14}=0.00046

P(x=2)=\frac{15!}{2!13!} (0.5)^{2} (1-0.5)^{13}=0.00320

P(x=3)=\frac{15!}{3!12!} (0.5)^{3} (1-0.5)^{12}=0.01389

P(x=4)=\frac{15!}{4!11!} (0.5)^{4} (1-0.5)^{11}=0.04165

P(x=5)=\frac{15!}{5!10!} (0.5)^{5} (1-0.5)^{10}=0.09164

P(x>5) = 1 - P(x≤5)= 1- 0.00003 - 0.00046 - 0.00320 - 0.01389 - 0.04165 - 0.09164 = 0.8491

4 0
3 years ago
What is the answer to this question it is urgent
UkoKoshka [18]

Answer: the answer is D

Step-by-step explanation: may i please have brainliest.

4 0
3 years ago
Read 2 more answers
I need help ..........
aliina [53]

Answer:

The answer is B

Step-by-step explanation:

You need to graph the equation from the left of equality sign which is y=x*1/6 and the other is -2x+5

The first has a point (0,0) and other point could be (6,1) from there you can have your graph

The second has one point in (2.5, 0) and (0,5)

4 0
4 years ago
Could someone please help me complete this chart for my geometry homework?
Snezhnost [94]

Answer:

so far we have

Step-by-step explanation:

18 90 76 28 14

A: 18*

B: 90*

C: 76*

D: 28*

E: 14*

F: none yet

G: none yet

5 0
3 years ago
The slope of line p is _, and the slope of line Q is _.
lutik1710 [3]

Answer:

From the graph, the slope of line p is 3 and the slope of line q is -3.

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