Probability and Statistics(Pls fast help, sitting on them for past 3 days 😭) | Mathematics | Page 1

polar needleBOT Jun 23, 2025, 9:55 AM

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spiral goblet Jun 23, 2025, 9:57 AM

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Basically I could do that

1/2 * 9/10 + 1/2 * 2/10
=11/20 = 0,55 = 55%

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Or I could use the sentence of bayes but idk because there is a variable missing

signal fractal Jun 23, 2025, 10:11 AM

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Okay, could you translate the problem

spiral goblet Jun 23, 2025, 10:12 AM

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signal fractal Okay, could you translate the problem

sure one sec

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c) A diagnostic test has the following accuracy data: If a person is infected, the test returns a positive result in 90% of the cases. If a person is not infected, the test returns a negative result in 80% of the cases. A person takes the test and receives a positive result. Assess the probability that the person is actually infected.

(AB III)

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@signal fractal

signal fractal Jun 23, 2025, 10:14 AM

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I'm reading it

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You basically want P( actually infected | the test is positive)

spiral goblet Jun 23, 2025, 10:15 AM

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yes

signal fractal Jun 23, 2025, 10:15 AM

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So what;s the formula for that

spiral goblet Jun 23, 2025, 10:16 AM

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signal fractal So what;s the formula for that

basically

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there is the sentence of bayes

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left side is what I have

signal fractal Jun 23, 2025, 10:17 AM

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Honestly, I think this doesn't require baye's formula

spiral goblet Jun 23, 2025, 10:17 AM

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really

signal fractal Jun 23, 2025, 10:17 AM

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This is the formula for conditional probability, right

spiral goblet Jun 23, 2025, 10:17 AM

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mhm

signal fractal Jun 23, 2025, 10:18 AM

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one minute

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right, you will need baye;s my bad

spiral goblet Jun 23, 2025, 10:18 AM

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signal fractal right, you will need baye;s my bad

oh you gave me hope for a sec 😭

signal fractal Jun 23, 2025, 10:19 AM

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I'm trying to recall, been ~2 years since I did probability

spiral goblet Jun 23, 2025, 10:19 AM

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its okay no problem

signal fractal Jun 23, 2025, 10:21 AM

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Actually, just ping helpers in 10 minutes, I don't want to risk misleading you

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Sorry

spiral goblet Jun 23, 2025, 10:22 AM

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signal fractal Actually, just ping helpers in 10 minutes, I don't want to risk misleading you

why in 10min tho

spiral goblet Jun 23, 2025, 10:22 AM

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signal fractal Sorry

its okay..

signal fractal Jun 23, 2025, 10:23 AM

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There's a rule that you can only ping helpers 15 minutes after posting a question

spiral goblet Jun 23, 2025, 10:23 AM

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signal fractal There's a rule that you can only ping helpers 15 minutes after posting a questio...

well

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i asked

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11:55

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its 12:23 now

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everything is math man..

signal fractal Jun 23, 2025, 10:23 AM

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okay, ping helpers then!

spiral goblet Jun 23, 2025, 10:24 AM

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<@&286206848099549185> yo someone down to help me please? 😭

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it says it doesnt ping the role

signal fractal Jun 23, 2025, 10:24 AM

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If this doesn't work, move to help channels

spiral goblet Jun 23, 2025, 10:24 AM

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signal fractal If this doesn't work, move to help channels

how do I do that

signal fractal Jun 23, 2025, 10:24 AM

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Post your question in #help-40 for instance

vestal frigate Jun 23, 2025, 10:42 PM

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Have you used this? (Bayes' Theorem basically)

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It instantly gives the answer.

#Probability and Statistics(Pls fast help, sitting on them for past 3 days 😭)