4 When people visit a certain large shop, on average \(34 \%\) of them do not buy anything, \(53 \%\) spend less than \(
) 50\( and \)13 \%\( spend at least \)\\( 50\).
- 15 people visiting the shop are chosen at random. Calculate the probability that at least 14 of them buy something.
- \(n\) people visiting the shop are chosen at random. The probability that none of them spends at least \(
) 50\( is less than 0.04 . Find the smallest possible value of \)n$.