need help with #35-40. Seven balls are randomly withdrawn from an urn that conta
ID: 3207304 • Letter: N
Question
need help with #35-40.
Seven balls are randomly withdrawn from an urn that contains 12 red, 16 blue and 18 green balls Find the probability that 3 red 2 blue and 2green balls are withdrawn; at least 2 red balls are withdrawn all withdrawn balls are the same color either exactly 3 red balls or exactly 3 blue balls are withdrawn. Two cards are chosen at random from a deck of 52 paying cards What is the probability that they are both aces? have the same value? An instructor gives her class a set of 10 problems with the information that the final exam will consist of a random selection of 5 of them. If a student has figured out how to do 7 of the problems, what is the probability he or she will answer correctly all 5 problems? at least 4 of the problems? There are n socks. 3 of which are red. in a drawer. What is value of n if. when 2 of the socks are chosen randomly, the probability that they are both red is 1/2? There are 5 hotels in a certain town. If 3 people check hotels in a day. what is the probability that they e check into a different hotel? What assumptions are you making? A town contains 4 people who repair television s break down, what is the probability that exactly of the repairers are called? Solve the problem for i= 1, 2, 3, 4. What assumptions are you making? a die is rolled 4 times, what is the probability that 6 comes up at least once?Explanation / Answer
37.
There are 10 problems
5 will be in exam
Student figures out how to solve for 7 of the 10 problems
p=.7
a.
P( all 5 are correct) = 5C5(.7^5)(.3^0)
= .7^5
=.168
b.
P(X>=4) = 5C4(.7^4)(.3^1) +5C5(.7^5)(.3^0)
=5*.7^4*.3+.7^5
=.528
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