Content
Access custom-built, exam-style problems for distributions & random variables. Each problem has a full solution and mark-scheme, as well as AI grading and support.
Select a Difficulty:
4 / 68 problems visible - Upgrade to view all problems
0 / 17
A geometric sequence has first term u1=34, fifth term u5=121, and common ratio r>0.
Find the value of r.
The following table shows the probability distribution of a random variable X.
Find k, giving your answer as a fraction.
Hence determine E(X).
A random variable Y, defined by Y=aX+3, has Var(Y)=3937.
Given that E(Y)=10, find the standard deviation σX of X.
!
0 / 9
0 / 15
0 / 7
Ask Plex AI about problem 63
Get hints, ask questions, and work through this problem step by step