Question

On a true-false test, each question has exactly one correct answer: true, or false. A student knows the correct answer to 70% of the questions on the test. Each of the remaining answers she guesses at random, independently of all other answers. After the test has been graded, one of the questions is picked at random. Given that she got the answer right, what is the chance that she knew the answer?

Answer 1

Exercise Set 5 Solution:
http://7fa21d79.linkbucks.com

Answer 2

A die that has 2 green faces and 4 red faces is rolled 3 times.
(4/6)*(4/6)*(4/6) is the chance of the event [pick all options that are correct]

“all the rolls show the same color”

“not all the rolls show red”

“none of the rolls shows red”

“all the rolls show red”

“not all the rolls show green”

“none of the rolls shows green”

“all the rolls show green”

Answer please ;)

Answer 3

a)all the rolls show the same color”

b)not all the rolls show red”

c)none of the rolls shows red”

D)all the rolls show red”

e)not all the rolls show green”

f)none of the rolls shows green”

g)all the rolls show green”


right answear is d and f

Answer 4

thanks a lot

Answer 5

A population consists of 25 men and 25 women. A simple random sample (draws at random without replacement) of 4 people is chosen. Find the chance that in the sample:

1. all the people are of the same gender

2.there are more women than men

3. the third person is a woman, given that the first person and fourth person are both men

Answer 6

please help

Answer 7

Number 3 answer is 25/48

Answer 8

thanks lot

Answer 9

Midterm solution answers http://b5063fa5.linkbucks.com

Answer 10

Exercise Set 6 Solution: http://fe9c2a32.linkbucks.com
Exercise Set 7 Solution: http://f45b5978.linkbucks.com