The life of a certain type of battery, BBB hours, is normally distributed with a mean of 120 hours and a standard deviation of 16 hours.
Find P(B>144)P(B > 144)P(B>144).
Find the value of kkk such that P(B<k)=0.15P(B < k) = 0.15P(B<k)=0.15.
Ben is preparing for a 12-hour recording session. Given that the battery has already been in use for 144 hours,
find the probability that the battery will not run out before the session is completed.
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.
