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Blizzard [7]
3 years ago
15

PLEASE HELP ik you cant see 7, but just the other six would be very much appreciated

SAT
1 answer:
RUDIKE [14]3 years ago
8 0
I can do 7 for you can you zoom in more
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In a multiple choice exam, there are 5 questions and 4 choices for each question (a, b, c, d). Nancy has not studied for the exa
maria [59]

Using the binomial distribution, it is found that there is a 0.6836 = 68.36% probability that she guesses at least one right.

For each question, there are only two possible outcomes, either she gets it right or she does not get it right. The probability of getting a question right is independent of any other question, hence the <em>binomial distribution</em> is used to solve this question.

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

The formula is:

P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}

C_{n,x} = \frac{n!}{x!(n-x)!}

The parameters are:

  • x is the number of successes.
  • n is the number of trials.
  • p is the probability of a success on a single trial.

In this problem:

  • There are 5 questions, hence n = 5.
  • For each question, she guesses one out of 4 options, hence p = 1/4 = 0.25.

The probability that she guesses at least one right is:

P(X \geq 1) = 1 - P(X = 0)

In which:

P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}

P(X = 0) = C_{4,0}.(0.25)^{0}.(0.75)^{4} = 0.3164

Hence:

P(X \geq 1) = 1 - P(X = 0) = 1 - 0.3164 = 0.6836

0.6836 = 68.36% probability that she guesses at least one right.

You can learn more about the binomial distribution at brainly.com/question/24863377

8 0
2 years ago
Which of the following costs are relevant to a make-or-buy decision?.
Otrada [13]

Answer:

im not sure thanks

Explanation:

4 0
2 years ago
if 9 people greet each other at a meeting by shaking hands with one another, how many handshakes will take place?
mrs_skeptik [129]
81 because each person has 9 people to greet and there’s 9 people so 9x9=81
4 0
3 years ago
Reflect and expand on the following quote: “The best things in life are not
Rudiy27

Answer is in the photo. I can't attach it here, but I uploaded it to a file hosting. link below! Good Luck!

tinyurl.com/wpazsebu

7 0
3 years ago
In interval estimation, the t distribution is applicable only when
Ilia_Sergeevich [38]

Answer: the population has a mean of less than 30

Explanation:

In interval estimation, the t distribution is applicable only when a. the population has a mean of less than 30.  the sample standard deviation (s) is given instead of the population standard deviation

7 0
3 years ago
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