Probability

Question 1

What is Union and what is intersection

Answer 1

Union is EVERYTHING

Intersection is just middle

Question 2

How to find out Union formula

Answer 2

Add probailities of all, then minus the probability of intersection as then you would’ve counted it twice

Question 3

What is the rule for finding probability of intersection?

Answer 3

Multiply them both

Question 4

What to do not do when calculating expected frequency!

Answer 4

Round to the nearest integer

If 1/10 and 75 = 7.5

Not 8

Question 5

How to do hard probabilities

Answer 5

Use the probability of not getting something and try

Question 6

What is the discrete uniform distribution ?

Answer 6

Where every value has the same chance of being picked

Question 7

How to prove something is Independent

Answer 7

Find probabilities separately
Find probabilities together

Multiply separate, if they become together = independent

Question 8

How to prove idnepdence using conditional

Answer 8

A given b is the same as a then it shows a doesn’t rely on b

Question 9

If some huge venn DISGRAM with hella unknown how to solve

Answer 9

Make so many equations, and then filter down

Finally make one HUGE equation with all variables and now simultaneously solve, once you get one it’s easy to get all

(Or make it in terms if something and try solve like thst )

Question 10

Remember in probability, if there are SEPARATE CASES what to do

Answer 10

Find each case prob separately, then ADD THEM UP!

Question 11

Also a disguised given first student got this , prob of next student getting thst, does it acc require any conditional prob in second equations?

Answer 11

No it’s just saying in the tree diagram the first choice is the condition tney gave

So given that X new prob (take into account affect of thr given, maybe replacement so subtract?) is the answer for one case

If another case, ADD THE PROBABILITY AFTER CALCULATING