For a statistics student of 100 level what are the topic and calculation he must understand

In descriptive statistics, students must know how to calculate and interpret measures of central tendency such as the mean, median, and mode, and measures of variability like the range, variance, and standard deviation. They should also understand how to create and interpret various graphs and charts like histograms and box plots.

For basic probability, understanding sample spaces, events, and calculating probabilities of simple events is crucial. This extends to understanding random variables, both discrete and continuous, and their associated probability distributions, including calculating expected value and variance.

Finally, an introduction to inferential statistics involves understanding the concept of sampling, the Central Limit Theorem, and the basic ideas behind confidence intervals and hypothesis testing for means and proportions.