Guided, difficulty 1 of 3
Median absolute deviation
Nine bank customers waited the following number of minutes for a callback:
34, 104, 23, 21, 19, 21, 30, 30, 27
Calculate the (unscaled) median absolute deviation, MAD. Give it to 1 decimal place.
Practice
Practise until it sticks
Choose a topic, a skill or a difficulty. Calculation exercises have new versions with fresh numbers once you have solved them, so you can practise the method rather than memorise an answer.
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