The arithmetic mean of negative odd numbers in the array#9958
Given an array of integers, your task is to calculate the arithmetic mean of the negative odd numbers within the array. If there are no negative odd numbers, output NO.
The first line contains the integer (1 \leq n \leq 100), representing the number of elements in the array. The second line contains integers, each with an absolute value not exceeding .
Print the arithmetic mean of the negative odd numbers, formatted to two decimal places. If there are no such numbers, print NO.
Example 1
Example 2