Q1. Estimating the age of glacial drifts. Tills are glacial drifts consisting of a mixture of clay, sand, gravel, and boulders. Engineers from the University of Washington's Department of Earth and Space Sciences studied the chemical makeup of buried tills in order to estimate the age of the glacial drifts in Wisconsin (American Journal of Science, Jan. 2005). The ratio of the elements aluminum (Al) and beryllium (Be) in sediment is related to the duration of burial. The Al-Be ratios for a sample of 26 buried till specimens are given in the accompanying table. 3.75 4.05 3.81 3.23 3.13 3.30 3.21 3.32 4.09 3.90 5.06 3.85 3.88 4.06 4.56 3.60 3.27 4.09 3.38 3.37 2.73 2.95 2.25 2.73 2.55 3.06 Answer the following using RStudio. (a) Construct a histogram of the Al-Be ratio. (b) Based on (a), would you expect the mean to be about the same, less than or greater than the median? Explain. (c) Find the sample mean and median of the Al-Be ratio. (d) Find the standard deviation and range of the Al-Be ratio.