1.41 Fanny, Weise, and Henderson (2003) studied the impact of a photovoltaic system installed on the rooftop of the National Institute of Standards and Technology Building on the conservation of electricity usage. The energy savings were recorded monthly from November 2001 until October 2002.

a Make a bar chart that shows savings in the three categories over time.
b Describe the patterns observed in the chart.
c Compute the mean and standard deviation of the total savings over the one-year period.
d Construct a boxplot for the total savings.
Identify the outliers, if any.

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Month Energy Savings Max Peak Demand Thermal Total Savings Savings Savings Nov 01 71.49 1.77 5.09 78.35 Dec 01 61.43 37.39 9.57 108.38 Jan 02 54.47 50.10 8.52 113.09 Feb 02 94.84 56.71 8.47 160.01 Mar 02 104.19 75.28 6.56 186.03 Apr 02 132.77 63.33 3.17 199.27 May 02 166.18 79.92 1.66 247.75 Jun 02 164.24 38.40 0.60 279.19 Jul 02 154.17 81.12 0.87 433.12 Aug 02 148.62 56.71 0.81 343.81 Sep 02 140.58 56.97 0.16 336.02 Oct 02 67.35 31.09 4.35 192.92 Total 1,360.32 628.76 49.83 2,677.94