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Vladimir [108]
3 years ago
13

AREA OF A TRAPEZOID PLEASE HELP

Mathematics
1 answer:
shepuryov [24]3 years ago
3 0
A= a+b over 2 times height
18 + 8 = 26
26 divide by 2 = 13
13 x 6 = 78
area is 78
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The placebo effect is an example of a(n) experimenter bias. participant bias. random assignment bias. random selection bias.
densk [106]

Answer:

participant bias

Step-by-step explanation:

Participant bias is sometimes called as subject bias. it is referred to as the tendency of a subject that forces them to act in an experiment. it is held because that they think researchers is looking up to them to act. it occurs only when the subject has detail knowledge about the study or project.

Participant bias is a subject initiative to know about the inner thought of the researcher so the subject acts according to what the researcher wants to hear.

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An insurance company study shows that 9% of U. S. adults have diabetes. Suppose 8 US adults are selected at random. LetX be the
Bogdan [553]

Using the binomial distribution, it is found that:

  • The mean of X is of 0.72.
  • The standard deviation of X is of 0.81.

<h3>What is the binomial probability distribution?</h3>

It is the probability of exactly <u>x successes on n repeated trials, with p probability </u>of a success on each trial.

The expected value of the binomial distribution is:

E(X) = np

The standard deviation of the binomial distribution is:

\sqrt{V(X)} = \sqrt{np(1-p)}

For this problem, the parameters are given as follows:

n = 8, p = 0.09.

Hence the mean and the standard deviation are, respectively:

  • E(X) = np = 8 x 0.09 = 0.72.
  • \sqrt{V(X)} = \sqrt{np(1-p)} = \sqrt{8 \times 0.09 \times 0.91} = 0.81

More can be learned about the binomial distribution at brainly.com/question/24863377

#SPJ1

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2 years ago
Diana went shopping and purchased 4.2 pounds of peaches at $2.35 per pound and 3.8 pounds of blueberries at $2.50 per pound. Wha
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The answer is $19.37.
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Please help, I’ll mark you as brainliest!!!!!
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Answer:10

Step-by-step explanation:

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