On average, out of every 80 batteries sold, 76 are charged. Find the likelihood that the purchased battery is not charged

80-76 = 4 (batteries not charged), 4 ⁄ 80 = 1 ⁄ 20 = 0.05.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.