    #### Interquartile range

Consider this sample: $${45,47,49,50,52,55,57,60,63,65}$$ Now, find the interquartile range.

# Mean & median

Training
6     #### Negative Powers

This it's a multiple choise question. Consider the power: $5^{-2}\;+\;7^{-3}$ . This Power can be represented in other way. Choose the correct aswer.

# Powers

Training
8    Investigators did a test to find out the absolute frequency of how many students missed school in a week. There are 230 students. Number of days: $${Day 1...Day 7}$$ Absolute frequency: $${0,6,7,4,1,3,2}$$ What is the relative frequency? Please round to three decimal digits here.

# Absolute & relative frequency

Training
5    #### Natural Logarithm

Fill in the blank spots.

# Exponential properties

Learning
11    #### Exponential Function

The function $y=3^x$ is given. For what $x$ has the function the values $0.4$ and $1.4$? Round to three decimal places.

# Exponential function

Training
11    #### Median of heights

Some students in a class measured their heights as displayed: $${155,157,162,164,166,177,177}$$ What is the median?

# Probability

Learning
5