It looks like you’ve uploaded an image with some math problems related to statistical analysis. Let's go through each question:

Problem 165:

You have a set of times from a 100-meter run. The goal is to: a) Create class intervals (classeninteilung). b) Calculate the mean for the class intervals. c) Calculate the mean without class intervals.

Steps:

1. Class intervals will be chosen by determining suitable ranges based on the times.
2. Mean with class intervals involves multiplying the class midpoint by the frequency of each class and dividing the sum by the total number of times.
3. Mean without class intervals involves directly averaging the recorded times.

Problem 166:

This question provides data on the age structure of the population in Switzerland in 2005 and asks: a) Calculate the relative frequency. b) Create a pie chart (Kreisdiagramm). c) Estimate the average age based on the population data, assuming a maximum age of 100 years.

I'll break down each question further, and we can calculate the necessary values step-by-step.

Would you like to start with problem 165, or would you prefer to tackle problem 166 first?