7. The table shows the monthly average high temperatures for Lethbridge, Alberta, in degrees Celsius. Use the table to answer questions 7. Month Feb Mar Apr May Jun Jul Aug Sept Oct Nov Dec Jan Average High -1.8 1.5 6.0 18.2 22.3 25.5 25.4 20.1 14 4.3 (°C) a) Find the sinusoidal regression for the following data? Round your values to 2 decimal places b) Calculate the average high temperature in Lethbridge in April? Use sinusoidal regression. SHOW YOUR WORK c) Calculate the average high temperature in Lethbridge in December? Use sinusoidal regression. SHOW YOUR WORK

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