Problem Bank | IB Math AIHL

[Maximum mark: 6]

James is sitting a multiple choice exam with 12 questions. Each question has 5 answer choices, of which only one is correct.

James randomly picks an answer on each question. Let X represent the number of questions James answers correctly.

State whether X is discrete or continuous.

[1]
To earn a crown, get your answer ready before you reveal the options!
Write down the value of E(X).

[1]
Find the probability that

X=4,

2<X<9.

[4]

Ask Plex AI about this problem

Get hints, ask questions, and work through this problem step by step

I'm Plex, here to help with problems on this worksheet!

[Maximum mark: 6]

James is sitting a multiple choice exam with 12 questions. Each question has 5 answer choices, of which only one is correct.

James randomly picks an answer on each question. Let X represent the number of questions James answers correctly.

State whether X is discrete or continuous.

[1]
To earn a crown, get your answer ready before you reveal the options!
Write down the value of E(X).

[1]
Find the probability that

X=4,

2<X<9.

[4]

Ask Plex AI about this problem

Get hints, ask questions, and work through this problem step by step

I'm Plex, here to help with problems on this worksheet!

[Maximum mark: 6]

James is sitting a multiple choice exam with 12 questions. Each question has 5 answer choices, of which only one is correct.

James randomly picks an answer on each question. Let X represent the number of questions James answers correctly.

State whether X is discrete or continuous.

[1]
To earn a crown, get your answer ready before you reveal the options!
Write down the value of E(X).

[1]
Find the probability that

X=4,

2<X<9.

[4]

[Maximum mark: 6]

James is sitting a multiple choice exam with 12 questions. Each question has 5 answer choices, of which only one is correct.

James randomly picks an answer on each question. Let X represent the number of questions James answers correctly.

State whether X is discrete or continuous.

[1]
To earn a crown, get your answer ready before you reveal the options!
Write down the value of E(X).

[1]
Find the probability that

X=4,

2<X<9.

[4]