The independent random variables XXX and YYY are defined as X∼N(50,42)X \sim N(50, 4^2)X∼N(50,42) and Y∼N(40,52)Y \sim N(40, 5^2)Y∼N(40,52). The random variable AAA is defined as
A=3X−2Y A = 3X - 2Y A=3X−2YFind:
E(A)E(A)E(A)
Var(A)Var(A)Var(A)
The independent random variables X1,X2,X3,X4,X5X_1, X_2, X_3, X_4, X_5X1,X2,X3,X4,X5 each have the same distribution as XXX. The random variable BBB is defined as
B=∑i=15Xi B = \sum_{i=1}^{5} X_i B=i=1∑5XiFind P(B>4A)P(B > 4A)P(B>4A).
Practise Edexcel A Level Maths The Normal Distribution with exam-style questions for A Level Maths. 439 questions, matched to the Edexcel A Level Maths (9MA0) specification and written in Paper 1, Paper 2 and Paper 3 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.
