In the Mammography Experience Study, individuals were asked about their prior experience with mammography (never, within 1 year, over 1 year). Use the summarized data in Table 4.19, based on the ???? = 412 responses of the women included in the Mammography Experience data set, to answer the following:

(a) Convert the raw counts into estimates of the percentage in each of the three mammography experience categories.

(b) Create a bar chart displaying the estimated percentages.