please solve the problem and any missing data assumed that I need parts a, b, c

5. The number of cell phone users has increased dramatically since 1987. According to the Semi-annual Wireless Survey, published by the Cellular Telecommunications & Internet Association, the mean local monthly bill for cell phone users in the United States was $49.94 in 2007. Last year's local monthly bills, in dollars, for a random sample of 75 cell phone users is summarized on CellBill.esv dataset and available to download on iLearn. (a) (3 points) Construct a QUANTILE-QUANTILE PLOT, BOXPLOT, and HISTOGRAM of the data. 19 (b) (4 points) At the 15% significance level, do the data provide sufficient evidence to conclude that last year's mean local monthly bill for cell phone users decreased from the 2007 mean of $49.94? That is, do you reject or accept the null hypothesis? You should clearly state your null and alternative hypotheses. (c) (4 points) Remove the two outliers (the largest two observations) from the data and repeat Parts (a - b)