Answer:
Option B)

Explanation:
We are given the following information the question:
The conjecture "The average age of students in this class is 22"
We have to design the null hypothesis based on this conjecture.
Null Hypothesis
- The null hypothesis always state equality to the population.
- It states that the sample is taken from the population and the sample has same statistic as the population.
The null hypothesis can be designed as:
