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This quarter, there is a 50% chance that Jason will pass Accounting, a 60% chance that he will pass English, and 80% chance that he will pass at least one of these two courses. What is the probability that he will pass both Accounting and English?

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The following table shows the distribution of Democratic and Republican U.S. Senators by gender.

MALES(M) FEMALES(F) TOTAL
DEMOCRATS(D) 39 4 43
REPUBLICANS(R) 52 5 57
TOTALS 91 9 100

Use this table to determine the following probabilities.

P M   and  D size 12{P left (M" and "D right )} {}
39 / 100 size 12{"39"/"100"} {}
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P F   and   R size 12{P left (F" and "R right )} {}
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P M   or  D size 12{P left (M" or "D right )} {}
95 / 100 size 12{"95"/"100"} {}
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P F   or   R C size 12{P left (F" or "R rSup { size 8{C} } right )} {}
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P M C   or  R size 12{P left (M rSup { size 8{C} } " or "R right )} {}
61 / 100 size 12{"61"/"100"} {}
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P M   or   F size 12{P left (M" or "F right )} {}
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Again, use the addition rule to determine the following probabilities.

If P E = . 5 size 12{P left (E right )= "." 5} {} and P F = . 4 size 12{P left (F right )= "." 4} {} and E size 12{E} {} and F size 12{F} {} are mutually exclusive, find P E   and   F size 12{P left (E" and "F right )} {} .

0

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If P E = . 4 size 12{P left (E right )= "." 4} {} and P F = . 2 size 12{P left (F right )= "." 2} {} and E size 12{E} {} and F size 12{F} {} are mutually exclusive, find P E   or  F size 12{P left (E" or "F right )} {} .

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If P E = . 3 size 12{P left (E right )= "." 3} {} and P E   or   F = . 6 size 12{P left (E" or "F right )= "." 6} {} and P E   and   F = . 2 size 12{P left (E" and "F right )= "." 2} {} , find P F size 12{P left (F right )} {} .

0.5

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If P E = . 4 size 12{P left (E right )= "." 4} {} , P F = . 5 size 12{P left (F right )= "." 5} {} and P E   or  F = . 7 size 12{P left (E" or "F right )= "." 7} {} , find P E   and  F size 12{P left (E" and "F right )} {} .

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Calculating probabilities using tree diagrams and combinations

Two apples are chosen from a basket containing five red and three yellow apples. Draw a tree diagram below, and find the following probabilities.

P both red size 12{P left ("both red" right )} {}
20 / 56 size 12{"20"/"56"} {}
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P one red, one yellow size 12{P left ("one red, one yellow" right )} {}
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P both yellow size 12{P left ("both yellow" right )} {}
6 / 56 size 12{6/"56"} {}
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P First red and second yellow size 12{P left ("First red and second yellow" right )} {}
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A basket contains six red and four blue marbles. Three marbles are drawn at random. Find the following probabilities using the method shown in [link] . Do not use combinations.

P All three red size 12{P left ("All three red" right )} {}
1 / 6 size 12{1/6} {}
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P two red, one blue size 12{P left ("two red, one blue" right )} {}
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P one red, two blue size 12{P left ("one red, two blue" right )} {}
3 / 10 size 12{3/"10"} {}
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P first red, second blue, third red size 12{P left ("first red, second blue, third red" right )} {}
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Three marbles are drawn from a jar containing five red, four white, and three blue marbles. Find the following probabilities using combinations.

P all three red size 12{P left ("all three red" right )} {}
10 / 220 size 12{"10"/"220"} {}
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P two white and 1 blue size 12{P left ("two white and 1 blue" right )} {}
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P none white size 12{P left ("none white" right )} {}
56 / 220 size 12{"56"/"220"} {}
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P at least one red size 12{P left ("at least one red" right )} {}
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A committee of four is selected from a total of 4 freshmen, 5 sophomores, and 6 juniors. Find the probabilities for the following events.

At least three freshmen.

45 / 1365 size 12{"45"/"1365"} {}
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All four of the same class.

21 / 1365 size 12{"21"/"1365"} {}
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Not all four from the same class.

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Exactly three of the same class.

324 / 1365 size 12{"324"/"1365"} {}
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More juniors than freshmen and sophomores combined.

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Five cards are drawn from a deck. Find the probabilities for the following events.

Two hearts, two spades, and one club.

79092 / 2, 598 , 960 size 12{"79092"/2,"598","960"} {}
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A flush of any suit(all cards of a single suit).

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A full house of nines and tens(3 nines and 2 tens).

24 / 2, 598 , 960 size 12{"24"/2,"598","960"} {}
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A pair of nines and tens.

1, 584 / 2, 598 , 960 size 12{1,"584"/2,"598","960"} {}
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Do the following birthday problems.

If there are five people in a room, what is the probability that no two have the same birthday?

0.973

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If there are five people in a room, what is the probability that at least two people have the same birthday?

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Conditional probability

Do the following problems using the conditional probability formula: P A B = P A B P B size 12{P left (A \lline B right )= { {P left (A intersection B right )} over {P left (B right )} } } {} .

A card is drawn from a deck. Find the conditional probability of P a queen a face card size 12{P left ("a queen " \lline " a face card" right )} {} .

4 / 12 size 12{4/"12"} {}
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A card is drawn from a deck. Find the conditional probability of P a queen a club size 12{P left ("a queen " \lline " a club" right )} {} .

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A die is rolled. Find the conditional probability that it shows a three if it is known that an odd number has shown.

1 / 3 size 12{1/3} {}
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If P A = . 3 size 12{P left (A right )= "." 3} {} and P B = . 4 size 12{P left (B right )= "." 4} {} , and P A   and  B = . 12 size 12{P left (A" and "B right )= "." "12"} {} , find the following.

  1. P A B size 12{P left (A \lline B right )} {}

  2. P B A size 12{P left (B \lline A right )} {}

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Questions & Answers

what is microbiology
Agebe Reply
What is a cell
Odelana Reply
what is cell
Mohammed
how does Neisseria cause meningitis
Nyibol Reply
what is microbiologist
Muhammad Reply
what is errata
Muhammad
is the branch of biology that deals with the study of microorganisms.
Ntefuni Reply
What is microbiology
Mercy Reply
studies of microbes
Louisiaste
when we takee the specimen which lumbar,spin,
Ziyad Reply
How bacteria create energy to survive?
Muhamad Reply
Bacteria doesn't produce energy they are dependent upon their substrate in case of lack of nutrients they are able to make spores which helps them to sustain in harsh environments
_Adnan
But not all bacteria make spores, l mean Eukaryotic cells have Mitochondria which acts as powerhouse for them, since bacteria don't have it, what is the substitution for it?
Muhamad
they make spores
Louisiaste
what is sporadic nd endemic, epidemic
Aminu Reply
the significance of food webs for disease transmission
Abreham
food webs brings about an infection as an individual depends on number of diseased foods or carriers dully.
Mark
explain assimilatory nitrate reduction
Esinniobiwa Reply
Assimilatory nitrate reduction is a process that occurs in some microorganisms, such as bacteria and archaea, in which nitrate (NO3-) is reduced to nitrite (NO2-), and then further reduced to ammonia (NH3).
Elkana
This process is called assimilatory nitrate reduction because the nitrogen that is produced is incorporated in the cells of microorganisms where it can be used in the synthesis of amino acids and other nitrogen products
Elkana
Examples of thermophilic organisms
Shu Reply
Give Examples of thermophilic organisms
Shu
advantages of normal Flora to the host
Micheal Reply
Prevent foreign microbes to the host
Abubakar
they provide healthier benefits to their hosts
ayesha
They are friends to host only when Host immune system is strong and become enemies when the host immune system is weakened . very bad relationship!
Mark
what is cell
faisal Reply
cell is the smallest unit of life
Fauziya
cell is the smallest unit of life
Akanni
ok
Innocent
cell is the structural and functional unit of life
Hasan
is the fundamental units of Life
Musa
what are emergency diseases
Micheal Reply
There are nothing like emergency disease but there are some common medical emergency which can occur simultaneously like Bleeding,heart attack,Breathing difficulties,severe pain heart stock.Hope you will get my point .Have a nice day ❣️
_Adnan
define infection ,prevention and control
Innocent
I think infection prevention and control is the avoidance of all things we do that gives out break of infections and promotion of health practices that promote life
Lubega
Heyy Lubega hussein where are u from?
_Adnan
en français
Adama
which site have a normal flora
ESTHER Reply
Many sites of the body have it Skin Nasal cavity Oral cavity Gastro intestinal tract
Safaa
skin
Asiina
skin,Oral,Nasal,GIt
Sadik
How can Commensal can Bacteria change into pathogen?
Sadik
How can Commensal Bacteria change into pathogen?
Sadik
all
Tesfaye
by fussion
Asiina
what are the advantages of normal Flora to the host
Micheal
what are the ways of control and prevention of nosocomial infection in the hospital
Micheal
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Source:  OpenStax, Applied finite mathematics. OpenStax CNX. Jul 16, 2011 Download for free at http://cnx.org/content/col10613/1.5
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