3 years ago

PLS HELP WITH SCREENSHOT I WILL MARK BRAINLIEST ASAP I NEED STEP BY STEP EXPLANATION.

Mathematics

1 answer:

7nadin3 [17]3 years ago

3 0

Answer: The answer is the other guys thing

Step-by-step explanation:

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earnstyle [38]

Hi,

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3 years ago

Which option is a false statement about Christopher Columbus?

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3 years ago

If Karri takes a 7 question true false test and guess on every question, what is the

dusya [7]

Answer:

The probability that she gets all 7 questions correct is 0.0078.

Step-by-step explanation:

We are given that Karri takes a 7 question true-false test and guess on every question.

The above situation can be represented through binomial distribution;

$P(X = r) = \binom{n}{r} \times p^{r} \times (1-p)^{n-r} ; x = 0,1,2,3,........$

where, n = number of samples (trials) taken = 7 question

r = number of success = all 7 questions correct

p = probability of success which in our question is probability that

question is correct, i.e. p = 50%

Let X = Number of question that are correct

So, X ~ Binom(n = 7, p = 0.50)

Now, the probability that she gets all 7 questions correct is given by = P(X = 7)

P(X = 7) = $\binom{7}{7} \times 0.50^{7} \times (1-0.50)^{7-7}$

= $1 \times 0.50^{7} \times 0.50^{0}$

= 0.0078

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3 years ago