Question: A person selects a key at random from four keys to open a lock. Only one key opens the lock. If the first key does

A person selects a key at random from four keys to open a lock. Only one key opens the lock. If the first key does not open the lock, she tries other keys until one opens the lock. Find the average of the number of keys a person will have to try to open the lock. Try the experiment 25 times.

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