A school district in Southern California offers an opportunity for families to open a college savings account for their children. The frequency table shows contribution amounts for a selected number of participants in June 2020. In your presentation answer the following questions:   a) What is the probability of a randomly selected household contributing a maximum of $15? b) What is the probability of a randomly selected household contributing between $20 and $30? c) What is the mean, variance and standard deviation of the contributions?

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