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poliver
08.12.2019 •
Mathematics
r
yuunicuto!
question 2: a federal report finds that a lie detector test given to truthful persons
have a probability of 0.2 of suggesting that the person is deceptive. a company
asks 12 job applicants to take a lie detect test. suppose that all 12 applicants
answer truthfully.
. what is the probability that exactly one is being deceptive?
. what is the probability that at most one is being deceptive?
• what is the mean and standard deviation of this distribution?
i need with the last two questions.
what is the probability that at most one is being deceptive?
what is the mean and standard deviation of this distribution?
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Ответ:
P(Exactly 1 is being deceptive) is
0.2062 .
P(At most 1 is being deceptive) is![\simeq 0.2749](/tpl/images/0409/1129/5bad7.png)
Mean of the distribution is, 2.4 and standard deviation of the distribution is,
Step-by-step explanation:
Let, the no. of truthful persons suggested as deceptive by the lie-detector test be denoted by the random variable X. Then, according to the question, in this case,
X
Binomial (12, 0.2)
So, here,
1. No. of trials = 12 = n (say)
2. Probability of success = 0.2 = p (say)
3. Probability of failure = (1 - 0.2) = 0.8 = q (say)
So,
P(Exactly 1 is being deceptive)
= P(X = 1)
=![^{12}C_{1} \times (0.2)^{1} \times (0.8)^{11}](/tpl/images/0409/1129/118fc.png)
P(At most 1 is being deceptive)
= P(X = 0) + P(X = 1)
=![\sum_{x = 0}^{1}(^{12}C_{x}\times (0.2)^{x} \times (0.8)^{(12 - x)}](/tpl/images/0409/1129/48312.png)
[From (1) putting the value of P(X = 1)]
= 0.2749
Mean of the distribution =![n \times p](/tpl/images/0409/1129/3194b.png)
=![12 \times 0.2](/tpl/images/0409/1129/51e07.png)
= 2.4
Standard deviation of the distribution,
=![\sqrt {n \times \p \times q}](/tpl/images/0409/1129/6cf77.png)
=![\sqrt {12 \times 0.2 \times 0.8}](/tpl/images/0409/1129/87499.png)
Ответ:
o
Step-by-step explanation:
Recognize, describe, and calculate the measures of the center of data: mean, median, and mode. The “center” of a data set is also a way of describing location.