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DedPeter [7]
2 years ago
8

David conducts his own study. He selects a random sample of 50 students and asks if they are getting 9 hours of sleep per night.

Thirty of the 50 students are not getting enough sleep.
Does David’s sample result provide convincing evidence that more than 50% of all students at the school are not getting enough sleep?

Mathematics
1 answer:
mrs_skeptik [129]2 years ago
5 0

Answer:

B

Step-by-step explanation:

Edge 2022

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A binomial probability experiment is conducted with the given parameters. Compute the probability of x successes in the n indepe
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Answer: 0.0031

Step-by-step explanation:

Binomial distribution formula :-

P(x)=^nC_xp^x(1-p)^{n-x}, where P(x) is the probability of x successes in the n independent trials of the experiment and p is the probability of success.

Given : A binomial probability experiment is conducted with the given parameters.

n=9,\ p=0.8,\ x\leq3

Now, P(x\leq3)=P(3)+P(2)+P(1)+P(0)

=^9C_3(0.8)^3(1-0.8)^{9-3}+^9C_2(0.8)^2(1-0.8)^{9-2}+^9C_1(0.8)^1(1-0.8)^{9-1}+^9C_0(0.8)^0(1-0.8)^9\\\\=\dfrac{9!}{3!6!}(0.8)^3(0.2)^6+\dfrac{9!}{2!7!}(0.8)^2(0.2)^7+\dfrac{9!}{1!8!}(0.8)(0.2)^8+\dfrac{9!}{0!9!}(0.2)^9=0.003066368\approx0.0031

Hence,  P(x\leq3)=0.0031

8 0
4 years ago
Which type of triangle will always have a perpendicular bisector that is also an angle bisector
Fofino [41]
The answer is an equilateral triangle

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3 years ago
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The 4 inch radius pizza for $3 or the 8inch radius pizza for $14
yan [13]

Answer: The 4 inches radius

Step-by-step explanation:

First find their unit price. Which the the price per inch.

3/4 = 0.75  

14/8  = 1.75  

6 0
3 years ago
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You need to figure out how many square feet one paint can will be able to paint, then take the 24 square feet and divide it by the how much the paint can can paint, then you’ll have how many paint cans you need
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Find the value of X.
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