A sample of 30 students at a local college were given a test consisting of 10 questions about current news events. The distribution of the number of correct answers given is recorded in the frequency column of the table. Questions that were not answered were marked incorrect. The frequency represents how many of the 30 students who took the test got a certain number of answers correct. For example, four students answered five questions correctly. Determine the mean number of points, /x, earned on the test. Give your answer precise to one decimal place.