Chapter 4, Problem 20P

Use the following information to answer the next flue exercises: Javier volunteers in community events each month. He does not do more than five events in a month. He attends exactly five events 35°o of the time, four events 25% of the time.

Three event 20% of the time, two event 10% of the time, one event 5% of the time, and no events 5% of the time.

20. Find the standard deviation.