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Shubhrajyoti Ghosh
Subject: Maths
, asked on 21/3/18
No links please
Q. In a Binomial (a, p) distribution show that
σ
x
2
<
μ
(where
σ
x
2
is variance and
μ
is mean of this distribution).
Answer
1
Arvind Singh
Subject: Maths
, asked on 20/3/18
lease answer this quickly
Often it is taken that a truthful person commands, more respect in the society. A man is known to
speak the truth 4 out of 5 times. He throws a die and reports that it is actually a six. Find the
probability that it is actually a six. Do you agree that the value of truthfulness leads to more respect
in the society?
Answer
1
Arvind Singh
Subject: Maths
, asked on 20/3/18
Please answer this fast:
Of the students in a school, it is known that 30% have 100% attendance and 70% students are irregular. Previous year results report that 70% of all students who have 100% attendance attain A grade and 10% irregular students attain A grade in their annual examination. At the end of the year, one student is chosen at random from the school and he has A grade. What is the probability that the student has 100% attendance?
(i) Write any two values reflected in this question
(ii) Is regularity required only in school? Justify your answer
Answer
1
Shubhrajyoti Ghosh
Subject: Maths
, asked on 20/3/18
No links please:
(i) For a binomial distribution, the mean and S.D. are respectively 4 and
3
. Calculate the probability of getting a non zero value from this distribution.
Answer
1
Megha Prasadan
Subject: Maths
, asked on 20/3/18
3 cards are drawn successively with replacement from a well shuffled pack of 52 cards. Find the mean and variance of red cards.
No link pls
Answer
2
Megha Prasadan
Subject: Maths
, asked on 20/3/18
The probability that meditation will reduce heart attack is given by 0.30. Then why are we multiplying 0.70 instead of 0.30 with 0.40?
Answer
1
Varnika Dhiman
Subject: Maths
, asked on 20/3/18
Why that's written 2 times ?!..
Answer
2
Chaitanya Kapoor
Subject: Maths
, asked on 20/3/18
Solve this:
EXAMPLE 6.
Two balls are drawn from an urn containing 2 white, 3 red and 4 black balls one by one without replacement. What is the probability that at least one ball is red?
Answer
1
Nithyashrri Saravanan
Subject: Maths
, asked on 19/3/18
Dear experts in a game a man wins for any other number when a die is thrown the man decided to throw a die thrice but to quit as soon as he gets a six find the expected value of amount he wins and loses here why are we not considering a situation when he does not get a six at all that is random variable is -3 no links please
Answer
1
Varnika Dhiman
Subject: Maths
, asked on 19/3/18
How do we get to know if it follows binomial distribution or not ?!.. Does every event follow it ?!.. [The image is just for reference, kindly take ANY example to explain this.]
Answer
3
Nithyashrri Saravanan
Subject: Maths
, asked on 19/3/18
Dear experts find the probability distribution of no of success in 3 tosses of a die where success is defined as six appears on at least 2 dice . No links pls
Answer
2
Varnika Dhiman
Subject: Maths
, asked on 19/3/18
Why did we use P&C here ?!.. Couldn't we use multiplication theorem, like for finding P(X=0), couldn't we write 4/52* 4/52 ?!..
Answer
1
Varnika Dhiman
Subject: Maths
, asked on 19/3/18
While finding variance, we need to draw a table in the solution, in which we've xi, pi, etc. etc.. So I wanna know the columns we need to make in both of the formulae ?!.. [Just mention the columns, for BOTH the formulae.]
Answer
1
Varnika Dhiman
Subject: Maths
, asked on 19/3/18
So I hope now it's clear what I want for example 18. Kindly explain. (If table can't be drawn, then a tree diagram would also work.)
Answer
2
Varnika Dhiman
Subject: Maths
, asked on 19/3/18
Kindly draw a table for all the info. given in question. Just the table.
18. Suppose that the reliability of a HIV test specified as follows.
Of people having HIV, 90% of the test detect the disease but 10 % go underacted. Of people free of HIV, 99% of the test are judged HIV -ive but 1% are diagnosed as showing HIV +ive .From a large population of which only 0.1% have HIV, one person is selected at random, given the HIV test, and the pathologist reports him/her as HIV +ive. What is the probability that the person actually has HIV ?
Answer
1
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What are you looking for?
Q. In a Binomial (a, p) distribution show that (where is variance and is mean of this distribution).
Often it is taken that a truthful person commands, more respect in the society. A man is known to
speak the truth 4 out of 5 times. He throws a die and reports that it is actually a six. Find the
probability that it is actually a six. Do you agree that the value of truthfulness leads to more respect
in the society?
Of the students in a school, it is known that 30% have 100% attendance and 70% students are irregular. Previous year results report that 70% of all students who have 100% attendance attain A grade and 10% irregular students attain A grade in their annual examination. At the end of the year, one student is chosen at random from the school and he has A grade. What is the probability that the student has 100% attendance?
(i) Write any two values reflected in this question
(ii) Is regularity required only in school? Justify your answer
(i) For a binomial distribution, the mean and S.D. are respectively 4 and . Calculate the probability of getting a non zero value from this distribution.
No link pls
EXAMPLE 6. Two balls are drawn from an urn containing 2 white, 3 red and 4 black balls one by one without replacement. What is the probability that at least one ball is red?
18. Suppose that the reliability of a HIV test specified as follows.
Of people having HIV, 90% of the test detect the disease but 10 % go underacted. Of people free of HIV, 99% of the test are judged HIV -ive but 1% are diagnosed as showing HIV +ive .From a large population of which only 0.1% have HIV, one person is selected at random, given the HIV test, and the pathologist reports him/her as HIV +ive. What is the probability that the person actually has HIV ?