Two satellite communication systems, Alpha and Beta, are being tested for signal latency. The latency of system Alpha, measured in milliseconds, is normally distributed with mean 85 and variance 12. The latency of system Beta, measured in milliseconds, is normally distributed with mean 81.5 and variance 18. The latencies for Alpha and Beta are independent. A single test packet is sent through each system.
Find the probability that the latency for the test packet on system Alpha is less than the latency on system Beta.
A transmission sequence consists of 60 packets. Assuming that the packets are sent simultaneously and all latencies are independent, find the probability that the total latency of system Alpha exceeds the total latency of system Beta by more than 250 milliseconds.
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.
