Need help understanding the process to get the right answers (all three please)

Hypothesis, Effect Size, and Power Problem Set 3.1: Sampling Distribution of the Mean Exercise Criterion: Interpret population mean and variance. Instructions: Read the information below and answer the questions. Suppose a researcher wants to learn more about the mean attention span of individuals in some hypothetical population. The researcher cites that the attention span {the time in minutes attending to some task) in this population is normally distributed with the following characteristics: 20 i 36 (p. ioz) . Based on the parameters given in this example, answer the following questions: 1. What is the population mean {u}? A .What is the population variance (02) '? | 3. Sketch the distribution of this population. Make sure you draw the shape of the distribution and include the mean plus and minus three standard deviations