4 Jenny and Omar are each allowed two attempts at a high jump.
- The probability that Jenny will succeed on her first attempt is 0.6 . If she fails on her first attempt, the probability that she will succeed on her second attempt is 0.7 . Calculate the probability that Jenny will succeed.
- The probability that Omar will succeed on his first attempt is \(p\). If he fails on his first attempt, the probability that he will succeed on his second attempt is also \(p\). The probability that he succeeds is 0.51 . Find \(p\).
\(530 \%\) of packets of Natural Crunch Crisps contain a free gift. Jan buys 5 packets each week.