In a box of 100 bulbs, 10 are defective. Two bulbs are chosen at random. The probability that both are non-defective is: MCQ with Answer and Explanation

Explanation:
India's population in 2011 was 1.21 billion (1210.2 million).

Explanation:
IMR is strongly inversely correlated with socioeconomic development; inadequate sanitation, malnutrition, and poor healthcare access increase risks of infection and complications causing infant deaths.

Explanation:
Combined mean = (n₁x̄₁ + n₂x̄₂) / (n₁ + n₂) weights each group's mean by its size, providing the correct overall mean when aggregating subgroup statistics.